I'm pretty sure you used to be able to link your existing Stack Exchange profiles together, but I just had to sign up from scratch on a site (as well as this one), with some random username.
I'm already active on a couple of sites, using the same username. It wouldn't accept my Stack Exchange id when I tried, so I have no idea how to link them.
How do I do it?
Worse still, now this random id seems to have been linked with the other random id on the sci-fi site.
I just want my username back!