The folks at Warhammer Online have posted detailed instructions for players wishing to access and copy characters to the test server.

The Public Test Server is coming soon, so in the meantime we wanted to provide you with instructions on how you can get onto the server as well as how to copy your characters and jump right into testing.

The purpose of the Public Test Server (PTS) is for the players to help us refine and test the latest version of the game by experiencing the changes firsthand and providing feedback and bug reports to Mythic. As such, we want to remind you that the content introduced to this server is still considered “in development,” and that bugs and issues not found on the LIVE server may occur on the PTS. All features and fixes listed below are subject to change until we release Game Update 1.0.5 to all live servers.

When leaving Feedback or Bug Reports we encourage you to provide details on why you feel the way you do or why you think something needs to be fixed. It's also important to note that when you submit a Bug Report, it automatically records your location in game so be sure to submit them at the location where you experienced them when you can!

Read more here.