Go to http://mail2.appsmail.com. Then type in your full email address and password in the appropriate fields, then click "Login".
After logging into your account, click on the "Settings" menu in the upper left corner & select "My Settings"
Click on the "Compose" tab.
Enter the text that you would like to appear at the bottom of all of your outgoing emails into the rich-text field provided to the right of "Signature".
Click on the "Save" button to finish.