To view room details:
go to the Administration tab
here you can see the all rooms that currently exist in your Rocket.Chat workspace along with details like number of users in a room, number of messages, type of room, etc as shown below:
You are provided with a variety of filters like Public, Private, etc available to help you sort them by type.
To edit room details:
click the room, you want to edit the details for
here you have options to change room's avatar, edit room details, and to configure other settings with respect to this room like Read-Only, Private etc. as shown below:
After making your desired changes, click Save button.
Search and click on the room you want to delete in the Rooms under Administration
Press Delete to delete the room.
Click Yes, delete it! to delete it.