In order to link accounts, you will have to have a PW account.
Many (most) people, take their usual @handle/forum name/current login, and use that as their new PW name/login as well.
The problem is that since PW doesn't let you set your display name (what we actually see in the forum) to be the same as your login name (for security I assume), if you make a PW account using your old Cryptic login, you've now locked yourself out of using that name as your display name.
Instead, if you haven't linked yet, when you go to set up your PW account, make your account name something different than what you've been using. Then, set your DISPLAY NAME to your old Cryptic account name/@handle/forum name, then link.
That should preserve your forum name.
Hope that's helpful. Sorry to those that screwed up (myself included)