How do I connect other apps to Foursquare?

You can connect other apps to your Foursquare account via the mobile app by tapping the ‘Me’ tab and then ‘My Settings.’ Then, select ‘Add and Manage Connected Apps’ and tap ‘Connect’ on the apps you want to link. Tap on each of the app icons to read a detailed description of how  it can enrich your Foursquare experience. Please note that when you hit the ‘connect’ button, it may initially take you to a separate window to create an account with the app you’re linking to. 

You can also connect to apps via your ‘Settings’ page on the website: https://foursquare.com/apps