I have gimp shop an I made a bitmap but i cant ues dds file in guerilla an gimp does not have bitmap file so how els do i put it in?

save from GIMP as a TIF, somewhere in data\.... TOOL is used to convert data\...\*.TIF to tags\...\*.BITMAP

I git the 1s park of what u sead but the other i dont git

Wheres the 1s Park?
He didn't sead anything.
You're a git.
Seriously, misspelling 80% of writing annoys me...

Make a shortcut to Command Prompt, put it on the desktop. hold Ctrl key while moving to copy the Start menu's shortcut
find it in Start->Programs->Accessories

Right click the shortcut, select Properties
change 'Start in' to ' "C:\Program Files\Microsoft Games\Halo Custom Edition" '
close it's Properties and double click the shortcut

type 'tool bitmaps <folder>', <folder> being wherever the TIF is in Data, like ' "levels\test\test\bitmaps" '. You don't need the quotes unless there's a space in a folder's name

open Guerilla, and open the bitmap just created by tool
change 'format' to explicit alpha, and run tool agian

if tool gives you an error, right click the Command Prompt window, select 'Select All', and press enter (that copies it), and paste into post