So you want to play an RPG campaign with the Dungeon PbEM app, very good choice!
Planning a campaign on this website is no different than planning a traditional one around a table or one through a more traditional PbEM approach
The first thing you have to do is to gather friends (perhaps this might be the hardest part, but fortunately is the only difficult one, and moreover you can find help on the Search Player page or on the discussion area at the official Facebook page!).
Once you have your group and you have decided who will be the Dungeon Master, he/she has to register and, at the same time, create the new campaign.
Then it's time for the PCs: each of you will also have to subscribe, choosing the "Playing character" option instead (input your character name) and select the campaign your Master has created.
With this you have almost finished the set up: the last step is for the Master (only he/she can do it) to change every character status from "Building" to "Active".
Now you're ready to start posting messages and your adventure can begin!
Attention, please: every user can run as many campaigns as he wants, as Master or PC as well, so you're invited to not register yourself twice. Double accounts will be deleted.