I need help one more time lol

Where do I accsses this editor from doom3? do i have to register? or get a mod or something Thank u for ur time!

There should be a "Doom3DED.exe" in your Doom3 folder. Start it and the map editor should pop up! Sometimes the mouse cursor isn't visible at start up, then you have to move the mouse and try clicking in one of the windows to make it appear.

Start doom 3 with a command line similar to this:

D:\games\Doom 3\DOOM3.exe +editor +r_mode 7 +r_fullscreen 0