Step 1:
Open your browser and log in to Rackspace. At the top right, click the menu button and then click Settings.
Step 2:
On the left menu, click Composing Email, and then click Add New Signature from the right.
Step 3:
Type a name for your new signature and paste your email signature into the text box provided. Once done, click OK and close everything to return to the main screen.
Step 4:
Your new email signature is now installed! Test it out by composing a new email to make sure it looks correct.