There are two ways that you can make a user a co-host.
During a meeting:
Using the participants window:
Once a participant has been made a co-host, they'll have access to the co-host controls.
Give co-host privileges to interpreters at the start of every meeting to avoid interrupting the presenter. This feature also allows the interpreters to spotlight themselves and remain visible in the recording. All participants will see the interpreter as the active speaker.