Step 1:
Email the signature to yourself and open the shared signature link on your phone.
If you’ve received a shared signature link, simply open it.
Step 2:
Copy the signature to your clipboard.
Step 6:
Important: Once you have pasted the signature into the box, shake the phone until the popup window below shows up and choose “Undo”.

Step 7:
Your new email signature is now installed! Test it out by composing a new email to make sure it looks correct.