When you send the registration information for the channel to chanserv, the nick that you're using at that time is automatically assigned as the Founder's nick. Owner designation (commonly shown as ~) is automatically set when the founder joins the channel.
What you're referring to as Moderator, is, I think, more commonly called Channel Admin, and designated by the & sign.
Going down the common list of access levels for a channel, they are as follows:
~ Founder/Owner (somc networks allow multiple people to have this designation, some don't show it at all)
& Channel Admin (see note for Founder/Owner)
@ Channel Op
% Channel Half-Op/Help-Op
+ Channel Voice
The sepcifics for your network may vary, but the @, %, and + indicators are pretty well universal.