How to Style and hyperlink email signatures for iOS
1 Write your signature
In Settings > Mail > Signature, type your signature, and select words to apply a bold, italic, or underline style to. Copy the text to the Clipboard, then paste it into a blank Pages document.
2 Add hyperlinks
Select a part of your signature you want to hyperlink, then tap Link in the contextual options. Insure “Link To” is set to Webpage, enter an address next to Link, tap Done, and repeat as needed.
3 Set your signature
It‘s wise to avoid changing your text’s font – keep it matching the rest of your email contents. Text color changes are fine, though. Copy and paste your signature back into the box in Settings.
4 Set up Thunderbird
Configure your email account in Thunderbird on your Mac: choose Tools > Account Settings > Account Actions > Add Mail Account. For some popular services, server settings are added for you.
5 Check composition
Select Composition & Addressing and insure “Compose messages in HTML format” is enabled. Email your sig from iOS to the account just set up, then rightclick it and pick Edit As New Mesage.
6 Add FaceTime links
Select text to link, choose Insert > Link, and type facetime-audio:// or facetime:// then your FaceTime email or number. Email back to your iOS device, and copy and paste it as your signature.