Navigate to the board where you want to add the subscriber.
3
Click on the "Invite" button located on the top-right corner of the board interface.
4
In the "People" section, you will see a list of all the current members of the board.\
Scroll down to the bottom of the list and click on the "+ Add People" button.
5
A pop-up window will appear, allowing you to invite new members to the board. Enter the email address of the subscriber you want to add.
6
Click "Invite as a member"
Once the subscriber receives the invitation via email, they can accept it and join the board as a member.