Once logged into your webmail, click on ‘Options’ towards the bottom left of the screen. it should look like a small picture of a blank page –

This will give you the options page.

Click the ‘Edit Signature’ Button – located about halfway down the options page. This will pop up a new window –

Type the Signature you wish to be included in outgoing emails, and click ‘Save and Close’. This will close the popup window and drop you to the options screen. Click ‘Save and Close’ on this screen.