Claiming your clan is very simple. Just your the search functionality to find your clan's page.
After that all you need to do is click the UNCLAIMED link.
In order to prove that you are the leader of the clan you need to set your clan's public descriptions to be exactly the same with your clan's name
in Lineage 2 Revolution.
Once you do that click the button below and we will verify that the clan is yours. After the verification feel free to change your description again.