In order to follow someones posts, you first need to request access.

1. Open the Settings menu by tapping on the three horizontal bars in the top left of the Following screen.
2. Tap the Following menu item.
3. Tap the + icon in the top right of the screen.
4. Enter the email address of the person you’d like to follow.
5. Tap the Send button in the top right of the screen.

The person will receive an email to let you know you’d like to follow them.

If they have a Foto Feed account already, they will be able to accept your request from their Followers screen.

If they do not have a Foto Feed account, they can install Foto Feed, create an account, and they will be able to see your request in the Followers screen.