what is legal and illegal
 

i don't no what songs i can and cant without getting in serious stuee. thanks

Go to Tools > options > Searcing > Lisence Warning and make sure the box is ticked and select apply...

That way you will be sure of not downloading anything with a copyright attached to it...;)

what do i do when a message box comes us saying that the license not found. thanks.

That means the file has a copyright attached, so it is illegal to download if you don't have the lisence...;)