Certain add-ons require an additional system, organisation, group or user specific add-on configuration to make them work. For example, this could be preferred user, group or default setting of the add-on or authentication tokens to connect with a third party systems. This is highlighted once the add-on have been installed. 

Once an add-on is installed you can configure the add-on in the add-on information by clicking configure

In the appeared dialogue, you can set the configuration of the add-on. Once the add-on has been configured, the add-on is accordingly marked. Please note that this label does not indicated if the add-on is correctly configured.