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.
Copy the signature to your clipboard.
Open the native Mail App on your Android device. In the top right, press the menu button with the 3 dots, then press Settings.
In the Settings menu, select General Settings.
In the General Settings menu, ensure that Use signature is ticked and then go into Signature.
Remove any text that is currently in the signature text area. Press and hold over the email signature text area until a pop up box comes up and then Paste the new signature in there. Once done, press Save.
Your new email signature is now installed! Test it out by composing a new email to make sure it looks correct.