@Paree: I'll upload the manual here a little later. To edit the kit, you have 2 options:
1. edit it for existing textures
2. edit the templates
Option 2 is the easiest:
go to the models folder. You'll see kit textures there. Each team is assigned a kit. By default, all teams have kit 0.
Start the Texture Preview tool, this will let you view the model as you paint on the kit texture. Whenever you make a change to your texture and save it, the model will refresh.
When you're happy with the texture, close the Texture Preview tool.
Now start the Team Editor. Select the team you want to modify and make sure the kit for the team is the same number as the kit you just created.
Save. When you start a game playing with that team, the new kit should be visible.