This article describes how to configure your signature in the webmail facility.
Cheaper Domains based email address and password.
Login to Webmail
Click on Settings in the top right.
Select Identities which is the 3rd option in the first column on the left.
This will give you a list of the identities created on this account, typically there will only be one... Click on this.
Scroll down and you will see a box for the Signature which supports HTML formatted text.
Adjust signature and click Save.
Note: Signature does not currently support upload and embedding of images, you can use html to reference an external image if desired.
Note: If you can't find an answer to your problem click Here to open a support ticket (requires log in).