| Bearded Ben |
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I assume you are talking about creating a messageboard alias. Click on either of the "My Account" links near the top of any page, look for something that says "messageboard aliases", click "Create new messageboard alias".
Once you've done so, you can post as that alias using the menu underneath the box you type in.
To add the stat block and bio get to their page, either by clicking the alias's name above a post or your's and then the alias in the alias tab. Once at the alias, there should be something under the profile tab to let you create or modify the alias's profile.