- First select the specific channel.
- To nominate additional channel admins, open the channel info by clicking on the channel name above.
- In the channel info, you will find the button "Members". Select it to see all members of this channel.
- You can search for specific members using the search function and select the option "Make channel admin" from the three dots menu.
In return, channel admin's rights can also be revoked by using the option "Downgrade to member".