Change Circuit in fuse panel???

I got a problem where my fuse keeps blowing for my powerseat. I thought it was the motors so I put an inline switch so I could just turn in on as needed.. I figured that if the fuse still blows I have bigger issues.. well the fuse still blew.. about 2 days later.. So i figure that it has something to do with the fuse panel under the hood since that is where the fuse is...

Question is.. can someone tell me or point me in the direction of information on how to add/change a circuit in the fuse panel?? I have no issues with elactronics or electricity. I have worked on many a electronics and do all my own car wiring if something needs replaced but I have not had to do anything with the fuse panel...

any help would be greatly appriciated...