In Applogie, navigate to your subscriptions and select Slack.  Click the image in the “Slack” card.  Click the INTEGRATION button and you should see this screen:


Click on the “Sign in with Slack” button.  You will be presented with a screen to enter your Slack URL:


Once you have entered your Slack URL, click the “Continue” button.  You will be presented with a screen to enter your “Slack” credentials.  Make sure the credentials you use are for an Owner/Admin level account.


Enter the username and password, then click “Sign in”.  You will be presented with the following screen.  Depending on your browser settings, you may need to resize the popup, or scroll down to see the “Authorize” button.


After clicking “Authorize”, a successful authorization will show the following screen:


The integration is now complete and you can close this window.