Congratulations on your first quilt. On the quilting interface page (page name in the top left corner in tiny letters) - quilting page, the repair button is in the row of buttons just to the right of center under the screen. Before tapping repair, you must tap release carriage to release the carriage so you can move it to change the bobbin. After changing the bobbin, tap repair. Move the carriage so the needle is about 5-6 stitches from where the bobbin ran out. You will need to over stitch the last 5-6 stitches. Tap Closest Stitch and the needle will move over the stitch path. Pick up the bobbin thread and sew. If you closed out and reopen the program, you will need to find where you are. Reset the safe area. If a panto, place the zone again using the reference point for that zone. Start stitching the zone without thread in the needle. Stop, then repair. Follow the instructions above. Good luck.