Why is my Brother SQ9185 Sewing Machine thread bunching up on the back side of the fabric?

Hi Ann-
I found this link for Brother SQ9185 regarding threading the self threader.
https://help.brother-usa.com/app/answers/list/st/5/kw/thread%20self%20threader/p/6518/page/1
How to use the automatic needle threader
Follow these steps to use the needle threader: 1. Thread the machine up to the needle. CAUTION The needle threader can only be used with home sewing machine needles size 75/11- 100/16. Check...

Hope this helps.

I also found this youtube video on threading a self threading machine. Highlight the link, right-click and "Go to https://video.search.yahoo.com/..."
https://video.search.yahoo.com/search/video;_ylt=AwrDQymj7u9dlzEABwz7w8QF;_ylu=X3oDMTBncGdyMzQ0BHNlYwNzZWFyY2gEdnRpZAM-;_ylc=X1MDOTY3ODEzMDcEX3IDMgRhY3RuA2NsawRjc3JjcHZpZAMuMWZiTVRFd0xqRXlpaEVKWGFfVmpnQS5NVGd4TGdBQUFBQlRGZ1cxBGZyA3lmcC10LXMEZnIyA3NhLWdwBGdwcmlkA1N0MlFsVHlFU1RPYm1nQVFkWFJrWUEEbl9yc2x0AzYwBG5fc3VnZwMxMARvcmlnaW4DdmlkZW8uc2VhcmNoLnlhaG9vLmNvbQRwb3MDNQRwcXN0cgNicm90aGVyJTIwc3ElMjBzZXdpbmclMjBtYWNoaW5lBHBxc3RybAMyNQRxc3RybAM2NQRxdWVyeQNob3clMjBkbyUyMGklMjB0aHJlYWQlMjB0aGUlMjBicm90aGVyJTIwc3E5MTg1JTIwc2V3aW5nJTIwbWFjaGluZQR0X3N0bXADMTU3NjAwNTQ3Mw--?p=how+do+i+thread+the+brother+sq9185+sewing+machine&ei=UTF-8&fr2=p%3As%2Cv%3Av%2Cm%3Asa&fr=yfp-t-s#id=9&vid=64b3d386b183082abaa9d1d63e50e21e&action=view

Hope this helps.

Check your stitch sample. Dollars to donuts it's the top thread bird nesting (also called thread nesting) under the fabric. Issues appearing under the fabric is usually top thread related. Problems appearing on the top of the fabric is usually bobbin thread related.

Remove the top thread from your machine.
Be sure to start with a brand new needle.
ALWAYS RAISE the presser foot and rethread the top.

...

You are getting a thread mess under the fabric? Frequently, this occurs because the top thread is not fully seated in the tension disk.

Install a brand new needle.
Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread the machine from the beginning.
If necessary, adjust the top tension so the top and bobbin threads meet in the middle of the fabric.

Sewing Machine Thread Bunching Up Here Why

Birds nest under the fabric big loops of thread top side looks good...

TIP Avoid Thread Bird Nesting with these Four Tips Stitching Sewcial

You will want to adjust the top tension for quilting like you do for other sewing. The tension is correct when the top and bobbin threads meet in the middle of the fabric (or quilt). Be sure to ALWAYS RAISE the presser foot when threading the top thread.

User Guide Manuals SQ9185 Others Brother (pg 43)

I am not sure as to your machine, are you saying a "brother" machine? If your tension is set, say on 6 and it is too tight, turn the dial one more number......to a 7 or to a five and then check again. Also, I would rethread the machine and also take the bobbin out and then put it back into the machine. A lot of times, the bobbin isn't threaded into the machine correctly and it bunches up. Also, you can't use certain thick thread on some machines.

adjust the tension to a appropriate setting,
See the video here.
Sewing Help Sewing Machine Problem Thread Bunching Under Fabric
The knob and its location can differ based on the model of your sewing machine.

Could be what is called thread nesting or bird nesting.

The first thing to try is installing a brand new needle in your machine. Then try the following suggestions:

sewing machine birdnesting

WHY IS THREAD BUNCHING UNDERNEATH MY FABRIC

3 Common Sewing Machine Problems and How to Fix Them

...

Sounds like the upper tension needs to be tightened, or the bobbin thread needs to be loosened. At any rate, the tension is correct when the two threads meet in the middle of the fabric for general sewing.

For free motion quilting, the tension should be adjusted so that the bobbin thread does not show on the top of the fabric, however, it should not lay in a straight line like it sounds like it may appear currently. What you are currently producing is a gathering stitch where the bobbin thread can be easily pulled.

...

try changing the needle
check the top thread tension to make sure it's not to loose
rethread the machine top & bobbin, make sure the bobbin is wound
correctly & inserted correctly into the machine
make sure the thread has not come off the thread take up lever

About the needle problem, Brother's FAQ gives the following response: 

Make sure the needle is correctly inserted with the flat side facing the back and pushed up into the machine as far as possible.

The needle could have been damaged or bent. If so replace with a new one.

Make sure the fabric is not pulled excessively when sewing. Let the feed dogs move the fabric. Do not pull the fabric.

The combination of needle size, thread size and fabric is incorrect. 
Be sure to use the correct needle and thread size for the fabric you are sewing.(example: Denim-size 16 needle and 40-50 heavy duty thread).

As for the manual, here's the link:
http://welcome.solutions.brother.com/BSC/public/files/dlf/doch000063/ps21xl55565700ug02en.pdf