Step 1: Click on this page https://developer.foursquare.com and log in with your Foursquare account.
Step 2: Click on "Create a new app" button
Step 3: Complete the fields on the Create a New App screen.
Step 4: Select your Account Tier
Step 5: Click "Return to My Apps" link
Step 6: Copy Client ID and Client Secret key and paste them to Social Login Pro app back office
Step 7: Click View/Edit
Step 8: Fill in the form as in the below screenshot
Click "Save changes"