- GM Menu
- "Edit Characters" (Second from the top left)
- "Add (Existing)" (Third down)
- Select yourself from the drop-down top right.
The "Add (Existing)" doesn't mean existing characters, but (to) existing
users - of which there's only one right now: you, the GM :) You'll get taken to a screen with a table, just fill those out following the instructions on that screen. Leaving Tag blank will default them to NPC, as donsr explained.