The following two settings available in Settings -> Community are related to the Friends application:
|Enable friends||Indicates if the Friends functionality should be available in other features on the live site.|
Friend management path
Node alias path of the page on which the Friendship management web part is placed. This is a special web part that handles friendship management actions from friendship request e-mails.
If a user receives an e-mail with friendship request, there are links for friendship approval or rejection included in the mail. When the user clicks one of the links, they are redirected to this page and the user guid and type of action is transferred in form of querystring parameters. The Friendship management web part processes the received parameters and performs the necessary tasks for friendship approval or rejection.
On the Community Starter Site, the Special-pages/Friend-management page serves exactly this purpose.