Start by going to your “invite” page from your SaneBox menu. Copy the unique invite code link, specific to your SaneBox account. To do so, click the box area around the code. That makes a copy of your link to your clipboard, to paste it later. https://www.sanebox.com/invitations
Now follow these steps, for the Yahoo Mail mobile app
1.) From Yahoo Mail on mobile, use the Menu button in your app to select Settings.
2.) In the list of Yahoo Mail app Settings, locate Signature.
3.) Tap into Signature settings, toggle it on, paste in your invite link, and enter a note that inspires.
If you have any questions - please reach out to us at support@sanebox.com!