What I would probably do is forget about using the Comcast tool to build your page. As much as I don't like using Microsoft Word as a page building tool, this may be a time to do it. It's the tool you have, and it works for something straightforward.
In Word, create what you would like your front page to look like. Have another page for each newsletter. I'd start with something very simple so that you understand the process. Then get content.
I have an example (click here), but it's been a while since I've played with it. Some of the words in the example explain what I did.
Essentially, create a one page document in Word and save it. Then use Save as Web Page which will create a file for the page (name it index.html where case matters - not Index.html) and a directory for all the page resources. Use a third-party FTP (it's built into Windows Explorer if you are using Windows) to upload the index.html file and the supporting directory.
If the Comcast web server sees that you have an index.html file, it will display that to visitors instead of the site built with the Comcast tool. If you go back to the Comcast page-building tool and change something, it will rename your index.html file (but not destroy it) to have a time/date stamp in the name. Rename it back to index.html to get it back.
You can create other pages with Word giving them different names, like 2011.10.html for the October newsletter. Just be sure to upload all the supporting files after using the Save as Web Page option.
Ask if you have questions.
