By default, you will have access only to the main server. To get to the test:
- Go to "Library"
- Find "Wild Terra Online" in the list
- Right-click and select "Properties"
- Click on the tab "Betas" and select from the list "developing - ...", as indicated in the screenshot. Code for selecting the test build is not required.
Accounts in the beta version and the primary server will be different, that is, using the Steam version it will be possible to move from playing to the test.