Protocols/Credentials are maintained at the "Network" level in the UVX server.
If you click on "test" in the left section, it will take you to the "Network". There you can click on the "Protocols/Credentials" and choose the type of credential to add/edit/remove.
Once the credential has been added at the Network level, you can navigate down to the "Agent" and "Discovery Settings" that you want and choose the credential to include in the discovery.
Ensure you "Save Discovery Changes" in the upper-right. Then the agent will "pull" the changes down for the next discovery run.
For questions and further assistance, contact Support@UVnets.com.