My bf gmc dodge ram 1500 , one of the fuses melted in his fuse box,and the tail lights and dash lights are not on now, will he have to get a whole new box or can he do somthing besides that, need some help ,please........

Depends on how much it melted. If just the fuse melted, pull it out and replace it. Although, if it melted, there is a possibility that you have a worse problem.

Might want to take it to a (reputable) electrical shop of some kind, to trace the source of the problem.