How do I remove an app from a Slack channel?

To remove an app from a channel, you can go to the Admin Console of the app, click on the Channels tab and you will see a list of the channels where Airspeed apps are installed. Click on the pencil and select the app to remove from the channel.

Or type in /remove in the channel and select the /remove @user. Then type @(insert_app_name) and click enter. This will allow you to remove any bot or user from the channel.