The thread wont stay threaded what shiuld my machine setting be set at

The thread pulls out when you begin to stitch? Pull more thread tail through the needle eye. You can also try holding the thread tails in your left hand when beginning the first stitches.

Remove ALL the threads from the machine.
ALWAYS RAISE the presser foot and rethread each thread in the order specified.

...

Clip the top thread next to the spool. Raise the presser foot and pull the clipped thread DOWN through the needle eye. (Always remove the top thread in this manner. NEVER pull the top thread up!!!)

Now, ALWAYS RAISE the presser foot and rethread the top thread. Verify the thread path is correct.

Set the top tension to the midway point (then tweak the tension by testing).

If the bobbin thread is still pulling out, the top thread tension needs to be tightened. The tension is correct when the top thread and bobbin thread meet in the middle of the fabric.

Understanding Thread Tension Threads

How to Achieve Ideal Sewing Machine Thread Tension Threads

Sewing Lesson 10 How to Fix Tension on Your Sewing Machine

..

Depends whether the thread is breaking or pulling out.

Usually, timing causes the threads to miss stitches. And, yes, timing can be repaired.

Remove ALL the thread from the machine and rethread from the beginning. Be sure to ALWAYS raise the presser foot when threading. This releases the tension disks so the threads will seat completely. However, it also helps to give each thread a little tug and sometimes the thread will pop when it seats.

If thead is pulling out, be sure to pull a lot (at least 6") of thread tail through before beginning to stitch.

If the thread is breaking, check that it is threaded correctly and that each thread is threaded in the proper order (usually upper looper first, then lower looper with the thread draped OVER the upper looper). Threading in the wrong order will almost guarantee it will not work.

Also check that the tensions are not set too tight. Generally, to start out, set all the tensions at the midway point.

...

Ewww! Wondering if the tension mechanism has gone haywire.

First, change the needle. (Is the thread still in the correct path or has it "jumped" out of place? If so, try slowing down the machine.) Remove the thread. RAISE the presser foot to insure the thread seats properly in the tension disk and rethread from the beginning. Check that the bobbin is threaded properly. Check the tension setting and retest.

If it is still malfunctioning, it may need service.

Here's an owner's manual:
User Guide

Usually, if the machine breaks thread, it is because it is threaded incorrectly, the tension is too tight, or there could be a bad needle. Make sure you are using the correct needle and inserting it properly.

Check to make sure the thread coming from the spool is not wrapped around something that it shouldn't, ie the spool pin or the thread tree.

Unthread everything, RAISE the presser foot, then rethread from the very beginning making sure the threads seat properly in the tension disks.

Thread each thread in order as instructed (usually the upper looper first and the lower looper second with the tail draped over the top of the first looper). Pull at least 6 inches of thread tail of all three threads and lay them all in a straight line under the presser foot extending toward the back of the machine.

BE SURE to check your threading sequence against the instruction manual diagram since missing one thread guide will cause problems.

Set all the tension dials to the midway point to test your stitching. HINT: it helps to thread with 3 different colors so you can determine which threads are presenting a problem.

When a thread breaks, it is best to rethread everything from the beginning. Sergers are very finicky machines and even if you try to rethread only the broken thread, they will generally refuse to work.

...

you probably wont find it listed anywhere as it is from experience and changes with different material thickness and needle size
SO how to set tension
thread the machine and adjust the tension until you feel a drag on the thread
now thread the needle and sew a piece of scrap material
if the thread bunches up underneath then increase the thread tension until it sews properly
if the bottom thread is pulled to the top or the thread keeps breaking loosen ti off a bit
when the stitch is being properly formed , both bottom and top threads should meet at the center of the two materials being sewn

My trouble shooting suggestions are:

check that the thread is in the thread take up lever eye correctly
Is the top tension set too tight, ie should be on 5
Is the thread catching somewhere in the thread path?
Is it catching on the thread spool itself, sometimes they have a little notch cut in the top edge to hold the thread tail but it could be getting caught in there during sewing. If so, turn thread spool up the other way or use a mushroom cap on top to hold the thread off the spool top edge.

just go through the top threading path checking thread is into all thread eyes correctly and not catching on anything and that it is threaded correctly, it should be one of the above causing this.

try another needle and set the tension a bit higher.

the needle thread tension is wrong
bunching up under the material indicates that it is too loose