How can I use a 3rd party font on an iPad? My Requirement:
I am trying to use Orkney light font in HTML email signature in a iPad

What I have got:
Have configured email sign, no issues except the font used in my design is missing.

What I want:
How to install this Orkney light font in iPad
You should be able to do this by following these steps:
- send to your iPhone the signature text styled the way you want it (including font)
- copy the signature
- paste it as is in your signature settings

Voilà!

FYI, the steps are illustrated here (despite the older iOS version)