The Slack screen enables you to integrate Slack into your website using the bot user OAuth token.

Accessing the screen

In the left sidebar menu, under "SETTINGS", click [External system integration] -> [Slack].

Image from Gyazo

Item descriptions

Image from Gyazo

SlackCheck the "Enable" box to allow Slack integration.
Bot user OAuth tokenBot user OAuth token obtained from the Slack API.
UpdateClick to apply the changes you made on this screen.