Related & Module info
You will need the Incoming WebHooks app added to your Slack.
If you don't have the Incoming Webhooks app added
In the Main menu > Administration > Manage apps.
In you Slack App Directory, go to Custom Integrations and Incoming Webhooks app in the integrations search.
Then add the app to your Slack by clicking the Add to Slack button.
Proceed to the If you have the Incoming Webhooks app added step.
If you have the Incoming Webhooks app added
Please see how to create your Slack webhook in the Slack docs here: Enable and Create an Incoming Webhooks
The webhook will look something like this:
Create a new connector or select the existing one out of the connectors list.