To find a bot and add it to your Slack work space go to the Slack App Directory and search for the app you require. Once you've located the app click on it and then....
You will now see the app listed under your work space in the Apps section at the bottom of the left hand menu bar.
To use the app just start asking it questions related to its purpose i.e. don't ask the Brexit Bot about pet care...ask it about Brexit! The description for the app will usually give you a good idea what it's about if the name doesn't.
That's it the bot will now answer your questions...or at least we know ours will!