HaloMods "Classic" Read-only Archive

how do i take my downloaded map and play it on halo ce?

First, make sure you actually have Halo Custom Edition, I do not want to get started on how many idiots didn't know the difference between PC and CE...
Next, extract the maps you download from the archive (maps are usually compressed as ZIP or RAR archives)
Then, simply place them in
C:\Program Files\Microsoft Games\Halo Custom Edition\maps
Then run haloce.exe and your done!

i'm reeeeeeeeealy sorry but it's on my desktop and my options are like run with and things like that i don't understand how to take it from there and put it in the maps folder

it says it's an RAR file not a MAP file

download winrar (google it), install it, and then double click the .rar file and it opens like a .zip