u/Emergency-Film-7622

Hello everyone first post here ! I’m trying to sew some jeans together and bought a new needle for the right material but Ive been having a birds nest issue every time I try. I opened my bobbin case to see if the little black thing that holds the bobbin was in place but it keeps jumping out. Might just go to a repair if this is something I can’t fix. Any YouTube links you’d suggest I watch please send. Also using Pixie Plus Singer sewing machine.