as far as i understood you have problems putting the crest on your clan.
You have to edit the crest from paint make it 16x12 pixels and save it as type 256 color bitmap and go from l2 open the clan window, press setcrest, the little window it appears you have to put the whole path for l2 to find the crest.
For example in that little window you can put : C:/clan.bmp