bobbin

I have a Singer Inspiration and I was sewing my boyfriend's mom's birthday present and then I moved to sewing decorative patches on my jeans. I notice all night the thread on the underside of what I was doing wasn't the best and when I got to my jeans the underside kept clumping, but I just went...

to feed upper thread ? no manual. just received the sewing machine. my wife and i have no idea of what we are doing.