You use Flirt to create and manage user libraries which store information about your account, other users, and other data.
Open Flirt, usually located in the Applications folder, and then choose File > New.
You can also click the Flirt icon in the Dock and choose New Document from the pop-up menu.
Login to your account, if desired.
To find new users perform a search.
To save your document, choose File > Save.