To include a simple text signature:

1. Click the ‘Settings’ App (grey gearwheel), then go to ‘Mail, Contacts, Calendars’, then to ‘Signatures’.
2. Simply type in or paste your signature in the box. Job done!
3.  Send an email out to another email address of yours to check the display.

To include an html signature (including an image/logo):

1. First, send yourself an email which you can open up on your iphone that includes your graphic email signature.
2. Open this email up on your iphone, 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 little blue markers at the end to highlight/surround your signature as best as possible. When highlighted, tap the ‘Copy’ button to copy your signatures to your iOS Clipboard.
3. Click the ‘Settings’ App (grey gearwheel), then go to ‘Mail, Contacts, Calendars’, then to ‘Signatures’.
4. Tap twice in the empty box and select ‘Paste’ from the popup menu.
5. If your signature looks distorted at this point, it may be that your device has applied special formatting .  You can remove this by shaking your device until the ‘Undo Change Attributes’ box appears – select ‘undo’ from the pop up window and your signature should now display nicely.
6. Go back to your Mail app and try sending an email from the account that you installed the signature on. It should now work as expected.