You mean your teamnumber? You should have set it in the F@H client options, if you do not know it it's probably 0.
Please set it to 43461, it's the OC3D team
Depending on which client you have:
- console: make a link to the .exe with the tag -configonly
- windows normal userfriendly gui: search for an options window. Don't know the exact way as I use a console client.