I am now showing how stupiid I am

I would like to put a Comodo banner in every email and post I have. I can not seem to do it right. I have tried to upload it to photobucket and then put it in the email or forum post. How do I do this? Outlook express will not work, forum post will not work.

RTF/Save it as your signature file.
Insert the image in this rich text file.
Have outlook express request the rtf file for your signature

Microsoft Support this might help you or it might not.
I found by testing different file formats sometimes work.
I use Thunderbird so I know