sarahrachel

My boyfriend's sister gave me her sewing machine that she said she used maybe once a few years ago. I left it at my boyfriend's so that I could see both at my place and his. It is a brother cs6000i. The tension is off and I don't know how to fix it. The blue is the top thread and the tan is the bottom. I can pull the blue thread at the end of my scrap fabric and it pulls all the way out. I've loosened the top tension to 1 and it does the same thing. I've turned the top tension up to 4.5 and while I can't pull the top thread out, the bottom thread still shows through. It's on the straight stitch setting. Any suggestions???