For Owner level users, navigate to Settings -> Integrations and then use the search bar to locate your integration.

Click the Slack integration to open the integration card.

You will be prompted to Connect Account via Oath2
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You will arrive at the Slack authentication page. Log into your workspace and choose the desired channel you wish to add them to.

After you have completed the authentication. click Connect to save the integration!

In order to send a report, head to Settings > Alerts & Reports > Recurring Reports section on the left-hand navigation.

Click the purple (+) button to add a new recurring report.

Once you know which audience(s) you want to track, select them from the dropdown.

After confirming the tabs of your report, toggle the button next to Sent to Slack Channel:
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You will be required to enter at least one email.

Confirm your sending schedule.

Click the purple Save button in the top right to save your setting and begin sending at a future date.