First things first. You may still need to download Slack.
Slack can be used on your desktop, laptop, mobile phone or via the web application.
Android: Download the Slack app on the Google Play Store
iOS: Download Slack on the App Store
For PC: The app can be downloaded here
For Mac: You can download Slack here
Web: Go to Slack.com and log in.
Our channel url is http://allocationshq.slack.com/