What am I doing wrong guys? As I sew ripstop nylon the thread will jumble up on the bottom side of the nylon (see picture). I don't know how to fix this. I got a new needle and I tried to use thick polyester thread but it always tangles and I have to restart the stitch.
Is it better to use wider stiches? Maybe I need thinner thread? A sharper nylon specific needle?
EDIT I added this part after a bunch of you guys posted ideas...
Ok, so I pulled out the machine in preparation for starting my project tomorrow and asked my wife to make sure everything looked good. The only thing that she fixed was putting the thread behind a tiny metal piece just above the needle. I have never done this and am unsure if this will resolve anything:
Second, what the heck does this thing do? I push down on the tab and (excuse my extreme niaveness) this metal thingy spins downward to fit around the needle. Maybe there is a tutorial online for how to work this machine, haha.
Third, here is a picture of the top of my machine. I didn't see anything about tension and I followed the instructions printed on the machine for threading it: