Login to webmail by navigating to apps.rackspace.com
Click on the menu in the top right hand corner
Click on "Composing Email"
Click on "Add New Signature" or Edit or Delete
Adding Email Signature
Type a name for your signature
Click "Enable Formatting"
Now you can modify the font style, font size or text color or add an image for your custom signature.
Also you can add a link to your signature by clicking the insert/edit link icon
Highlight the text or image and click the insert/edit link icon
Add the URL address
Click OK to close the Insert/Edit Link window
Click OK to close the Add New signature window
Click "Save" and you're done!
When you compose an email you can now choose your signature
If you want your signature to automatically show up
Go to the Identities tab choose the profile you want to add your default signature
Click the profile then Click Edit
In the Edit Identity window from the drop down menu choose the Default Signature you want to use
Then Click OK
Click Save and You're done!
The Full Name field is what your clients will see beside your email