Help for /rename

Usage:  /rename [discussion] new_name

To change your name once you've already logged into lily, use /rename.

Very simply, /rename allows you to pick a new name from your list of reserved 
names (see /help reserve). To change your name, type /rename followed by a name 
from your reserved names list.

You can also use /rename to rename discussions that you are the creator of. To 
do this, type /rename followed by the existing discussion name and the new name 
you want to give it.

(see also: discussions, reserve, retitle)