There must be an easier way but if you go to the member tab, you will get the rbw roster, find your name in there and then click it. Click on the alternate and then a choice will appear with EDIT/DELETE on the right side of the little box.
If for some reasons you cant do it, give me your new alias and I can replace Leonarda with the new one... wouldn't be a problem for me to do that for you.
Miri