To avoid any problem , please do as the following steps :
thats the best way to be sure thats really your servers. thank you.

Get it done automaticly by adding something in your server configuatation file!
Code:
sets tb_clanid "<clan_id>"

You need to replace <clan_id> by your own clanid, which you can find on your clanpage too.

http://et.trackbase.net/index.php?mod=claninfo&cidx=228

So, if you set this in your server config:
Code:
sets tb_clanid "228"
and restart the server, the system will automaticly assign your server to the clan with the id of 228