Fuse problem

A fuse doesn't want to seem to stay in the fuse box. I put it in the fuse box but it feels like there is nothing in that slot to hold it so the fuse won't stay. What do I do if there is a connection missing for that fuse or the fuse won't stay in the fuse box?

what has probly happend is the terminals are bent out, or the fuse is to small. you might have to release the terminals from behind the fuse block, and squeeze them shut with a pair of needle nose, not completely shut, but enough to hold the fuse tightly. then reinsert them into the fuse block and put it back together.