You will probably get a better answer if you post this question in the "Community Contributed Add-Ons/other modules" forum and include "About Us Page" in the topic title of your inquiry. The author of the contribution is more likely to monitor that forum. Also, you may want to check if you have the latest version of this contribution. The latest is v1.3.0.13 updated on August 29, 2007. The author has done a rewrite of the installation instructions.
The HEADING_TITLE that appears on your about page is simply an undefined text holder. You will need to find the file where "HEADING_TITLE" is supposed to be defined and enter the verbage you want to appear in it's place.
I downloaded the About Us Page contribution files and tried to locate where that definition is (probably in a file called /about_us.php which may be located in the extra_definitions folder) but due to time constraints couldn't take the time to discover exactly where this change should be made.
The "About Us Page" will not appear in a side box, only a link to the actual page should appear here. (Can you imagine squeezing all that verbage in a side box?).
I suggest downloading the latest version of the contribution and installing all over again and follow the instructions in the readme file precisely. It's very easy to miss or misinterprete a step in the instructions. Also, since the instructions were recently rewritten perhaps they will clear up the problem.
BTW the about me page looks fine on your site except for the HEADING_TITLE which can be fixed and the fact that the link to the page is missing from the Information sidebox.
Ron