HaloMods "Classic" Read-only Archive

when i open mainmenu.map in dothalo,, i do this to add a new map..
when i go to #12 to add new map I try to change the value to 450 or sumtin else it says error changinhg value does anyone know what the hell that is???!!!

thanx for te help

dont delete the value, just highlight it then type. if you try to delete stuff it gives an error.