for the orders tab issue, Delete the Dreamweaver Cache file from the users configuration folder:
http://www.webassist.com/tutorials/Common-installation-issues
when you first click the define button, it will show the table definition for the orders table preset, in the table list, you will need top select your LEDorder table.
for the issue wit hthe checkout page, if you use Fire Bug, you will see that you have styles in your /stylesheet.css that are conflicting with the eCart css.
for example:
#pagecontainer ul {
list-style-type: disc;
margin: 10px 15px 10px 25px;
padding: 0;
}
is over riding this css:
form.Sharp_Default ul.Sharp_Default {
list-style-type: none;
margin: 0;
padding: 0;
}