I don't think you're gong to have much luck finding help here. I did a little research and that bike is from china by a furniture company https://www.primointernational.com/ with knockoff sunrace components. it's a giveaway product when you buy furniture as far as I can tell. That's a self branded fork and at that price point, the dials are likely decoration. I'd ride it until it falls apart or becomes unsafe then buy a better bike. It's not worth investing anything in that bike.