1. View your html email signature in Safari
Open your provided email signature link in Safari
2. Copy your email signature
Tap and hold your finger on some part of the email body that is not a link.
When the iOS select box appears, drag the blue handles at the end to surround your signature.
Once surrounded, tap the “Copy” button to copy your signature to your iOS Clipboard.
3. Paste your email signature
Hit the home button to close Safari.
Navigate to the iOS Settings App, then to “Mail”, then near the bottom “Signatures”.
You will see a list of emails you have setup.
Tap twice in the empty box and select “Paste” from the popup menu.
Don’t close yet – we have one more step, as the signature doesn’t look right just yet.
4. Shake to fix
Apple automatically tries to “enhance” the signature when you paste it, causing it to become messed up and distorted. Luckily, they allow us to Undo these “enhancements”.
Shake your device until an “Undo Change Attributes” screen shows.
5. That's it
Enjoy your updated html email signature.