I have lost the Bobbin Case Cover for the Singer

It's a somewhat convoluted procedure. Check needle is not too low. See page 68 in manual.
https://www.singer.com/sites/default/files/product_manual/6dc4cd61b0c61a5fc13e60785f01d29199328059_0.pdf

http://www.manualslib.com/manual/581483/Singer-Touch-And-Sew-758.html

I LOVED these Touch and Sew machines! The bobbin is wound in place in the bobbin case; you just flip a lever on the left, and it will start to fill. However, you should download your instruction manual free from the Singer Sewing Machine site; it's pictured and discussed on page 7.

A heads up, though; those bobbins were available with a metal piece in the center and without; from the drawing it appears that yours takes the one without anything but a hole in the center. I owned BOTH types of machines at the same time once, and I had to be careful as to which bobbin I used in which machine.

There is a sprung retainer to hold the bobbin case in place

it does sound as if the sprung bracket is not holding the case in position. Move the latch to the right, remove and install the case and then move the retainer back into its proper position

try changing the needle--flat side goes to the back of machine
rethread the machine top & bobbin--make sure to use every thread guide
make sure bobbin is wound correctly & inserted correctly in the bobbin case
clean under the needle plate & in the bobbin area for lint or loose threads
if you don't have a manual try singer
Go to the singer website
Click on customer support--there will be a drop down menu
Choose instruction manual
In the box type the model number(example 758)
Click search

Many Singer manuals are available for sale or download from Singer: http://www.singerco.com/accessories/instruction-manuals . Enter the model number and then click Search. The link to download the Touch & Sew II 758 manual is http://www.singerco.com/uploads/download/6dc4cd61b0c61a5fc13e60785f01d29199328059.pdf . You will need Adobe Reader or a similar program to read the file. For $15, you can buy a printed copy.

I hope this helps.

Cindy Wells

Hi, welcome to fixya, maybe I can be of some help
I checked on singer website & they have a free downloadable instruction manual in PDF form just follow the these steps

Go to the singer website
Go to the home page
At the bottom of the page look for instruction manual--click on it
It will take you to another page
In the box put the model number (example 758 )& click search
the second one is free

Call Singer at 1-800-4singer and see if they will send you a manual, in the mean time google how to thread a sewing machine and there are some great videos available for free.

email me for retiming instructions and remind me of your make, [email protected]