This KB article will go through the process of logging into a BoviSync herd and switching herds once you are logged in.
Logging In:
2. Enter your credentials and click "Log In"
Switching Herds:
1. Click on settings (top right corner)
2. "Open Herd"
3. Use the selection box to browse through herds
4. Click "Open Herd"

Did you know you can login to multiple herds at once? See
Login Options for more information.