i modded marines but they wont move?

That's like telling a doctor that you feel pain. Be more specific.

To create a command list, you go to AI, then command lists. Click new instance. Open up your new command list, and select points. Right click in game view to place the point. Then go to commands. Create a new instance, then select the command. Go to the properties pane, and select "Go To". Set the modifier to keep moving, and the point to whatever point you want him to go to. Once done, select your AI. Go to the starting position, and in the properties pane, set the command list. Or, use the (ai_command_list) command in a script / Sapien console.

Firing positions. These are used for AI movements in a normal combat situation. They are also used for guard positions, and for pursuit.

When you are placing the squads, you'll notice the "Firing Positions" tab up there. Click it, add in positions the same way you would add in spawn points. To keep things simple for you, just have them all as "A" positions. The AI will pick and choose for itself which to use for hiding and attacking. You may put in more if you wish.

Go into the squads you placed, scroll down to the options "attacking", "attacking guard", "attacking search", "defending"... etc., and put in the letters of the firing positions you want them to use.

They will now move when you either next load Sapien, or compile the map.

EDIT: Didn't read the topic title. Eh, he'll probably find this information useful anyway.
Edited by drillinstructor on Feb 24, 2009 at 01:21 AM

Oh, that reminds me.

http://hce.halomaps.org/index.cfm?fid=2136

This teaches you to use command lists, firing positions, etc.