1. Login in webmail.
2. Click on the white box next to your email address in the top right corner.
5. Click on your email address under the Identities section.
6. Here you can create your email signature if you dont want a html signature and the tool bar looks like in the image bellow press the highlighted button. If you do want a html signature make sure the tool bar does look like the image bellow, when it does you can paste the html here.
7. If you aren’t using a html signature you can add images by pressing the button. and either upload it or paste the url in the alocated text box.