In your gamemode folder look for something called gamemode.txt inside the main folder. Open it up and the first few lines are which add-ons it will load with the gamemode.
Example from Blockheads Ruin Xmas:
//add-ons to load
ADDON Brick_Arch
ADDON Brick_Christmas_Tree
ADDON Support_Doors
ADDON Brick_Doors
ADDON Brick_Halloween
You're able to add anything under that, so if you wanted admin chat for example you'd add
ADDON Server_AdminChat to the bottom.
