An abridger is someone who makes or helps make an abridged series.
Requirements
There are a few things that you need in order to be an abridger.
A Name
In order to protect yourself from relentless fans and critics, you need to make a user name. It generally helps to make it unique and not a rip off of another abridger's name. Using a slightly modified version of another abridger's name makes it look like your series is so poorly done that you have to leech of someone else for viewers.
Roles
There are three primary roles an abridger can fill or they could fill all of them. They are: Voice Acting, Editing, and Scripting.
Voice Acting
Voice Acting is the most public of the three since the voice is heard by the audiance. Voice acting does require some skill in manipulating your voice, either on your own or with technology.
Editing
Editing is a mix of video and audio editing. One example of an editor would be KaiserNeko. Although he does do voice acting, he has done numerous editing jobs in several abridged series. Editing alone, however, does not make you an abridger without either scripting or voice acting.