wat do i press on opt 4.5

[DARK]

i dont know how u make a map smaller with opt i dont know which one to check on sometimes it makes it bigger or smaller but still says too big i need to know what to press on help me?

[DARK]

u know the options it gives u in opt idk wat to check on to make a map a smaller size to play it do i have to unprotect it if protectd


and can u give me like to get that program ur talking about