Then simply click the Add button, and the new POP account will be added. Note that if you wish to forward mail to your domain to a remote mailbox, creating a virtual POP user will not help. Instead, skip to the Forward section, and follow the instructions there. From here, you may create new accounts, delete accounts, or set an account to ctach all mail not addressed to any existing accounts, aliases, forwards, mailinglists, or autoresponders. This will set the mailbox you just created as the default address, where any e-mail to your domain that is not specifically adressed to any of the other addresses will go.
Aliases are additional addreses that point at existing POP accounts.
Then click Add to add the new alias. You may wish to make a new alias for Postmaster, and have it be the CatchAll account, instead of creating a new mailbox for personal use, though if you do this, your e-mail user must be postmaster. The proper syntax is explained on the page itself. If you wish to forward the CatchAll account, there is a special procedure for this. Create a temporary CatchAll account, then delete it.