You can add Gist (formerly Convertfox) or Intercom Chat widgets to your projects by going to the "Tracking & Scripts" section, which you can access by going into your project's settings or by choosing the option to publish the project.
Just select your chat service from the pulldown and enter your app/project ID.
Gist (formerly Convertfox)
How to find your Gist project or Workspace ID
Please make sure to set your project domain to "app.involve.me" or make sure "app.involve.me" is whitelisted for your project under Settings > Whitelist Domains.
Once you have added the widget to one of your projects, it will look something like this: