Pinpoint Pinners by Pinterest Username
If you already know the pinner username that you want to follow, simply put that name in the search bar. You will get some results. Then click on the appropriate one. After you have find Pinner you are searching for, just follow in order to start following their boards.
Pinpoint Pinners by Facebook
You can find pinners by using Facebook. This needs that your pinterest and Facebook accounts are linked. After linking, just select the option to search for friends on Facebook and all those friends with their pinterest accounts will be there at your glance
Pinpoint Pinners by Pinterest Email
If you are looking for someone and you have only an email, then go to the settings menu. In this menu, you will discover some of the options. Then, click on find friends. In that menu, further click on invite friends. You will proceed through the procedure of inviting someone, and if pinterest has the email on record, it will move you to their boards.