If you have the Slack integration configured, you have the option of attaching a team to a service, functionality, or incidents directly through Slack. It will be announced in the Slack channels associated with those components.
To attach a team to one of these components, go to the Slack interface and locate the specific incident for which you want to attach a team. Type:
/rootly add team
(Note that you must be in the incident channel specific to a given incident in order to use this command.)
An interstitial will pop up where you can select from the list of teams to add, then just click Submit.