To add Apps to your account, head over to Settings under the gear icon in the top right hand corner of your Runkeeper.com homepage. Then scroll down until you find the section labelled Apps on the left hand side
After you have found an App you are interested in adding to your profile, click the blue Connect To or Log In With button to the right of the App icon.
To connect with Apps, you must authenticate permission to allow the connection to take place between Runkeeper and the App, website or device. Depending on the app you choose, you may be asked to connect you may need to sign in to the Apps website, sign up for a new account with that website or download an App for your mobile phone.
You will have the option to "Deny" or "Allow" access to the App of choice. By clicking "Allow" the App will have permission to connect with Runkeeper.
To see which Apps are currently connected to your Runkeeper account, go to your Apps page.
From there, you will be able to see all your connected Apps, and be able to disable or remove them, by clicking the Disable Application Access link.