One of the admins would have to do it, BUT there is also a lot of work for you as well.
First, you need to decide on a name that you want to keep.
Let one of the admins know and we can send you an email for what you need to do in order to have it work properly.
Mine is
eddie@redtailboa.net and any of the others can be had by clicking on the admin mail link on the left side
(Disclaimer: It's not very often that we will change user names, so decide carefully when you join the site. We can do it in some cases, but choose carefully just in case

)