After logging into your SAASPASS Admin portal you should click on the "SAASPASS Slack Application" button on the admin landing page.

After clicking on the "SAASPASS Slack Application" button, you have tp click on the "Add to Slack" button.

After you choose your Slack Team click on the "Authorize" button.

You will get the message 'You have successfully installed SAASPASS on your Slack team'.