To create an HTML-rich template, go to the Templates library by clicking "Manage Templates" in the "Menu" section of your Yesware Sidebar or click "Open Templates' in the Outlook ribbon. Then select "New Template" in the upper right. On the right-side of the formatting tools, there's a "< >" button. Click that to create your template directly from HTML.
To use images in templates, simply select the "insert/edit image" icon in the formatting options. From there, you can either browse your computer for a specific file, drag and drop an image, or add the source code URL for an image. Then, select "okay." Finish typing up your template and save - you’re good to go!