1. Go to Developers section of FourSquare and click on My Apps at the top of the page.Foursquare
2. Click on CREATE A NEW APP.
3. Enter Download / welcome page url and Callback url given on Provider Settings page of LoginRadius account. Fill out rest of the fields accordingly and click on SAVE CHANGES when you are done.
4.FourSquare will generate the Client ID and Client Secret which you can copy and add to LoginRadius.