[header] How to add html to yahoo email [title] Open your html editor. [step] Launch your html editing software, like adobe dreamweaver, coffee cup, komodo, or whatever application you have on your computer. [title] Create your html code. 
[step] Start writing the html code you want to add to your yahoo email message. Keep in mind that only basic html codes like formatting, layouts, paragraphs, and images can be used on yahoo email.