You can find it from the AppSource which is at the bottom left of your navigation panel. Search for Booking Room Pro > Add to a team > click to Type a team or channel name > Search for the team you wish to add it to > Select the team and then click on Set up a Tab > choose the given settings and then Save.

Also, you can add it from the + sign at the top right of the channel view > search for Booking Room Pro > configure the settings > and then Save.

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