To edit your listing, here is what you want to do:

Login with your email address and password

If you forgot your password, you can retrieve it via email from that same page.

Once you Login to the site with your username and password and you will end up at your account page.

From there you want to edit your listing, so click on "EDIT LISTING INFORMATION" under your proper home listing.

On the resulting page you will be able to edit any part of your listing text.

Don't forget to hit the "SAVE MY LISTING INFORMATION" button at the top or bottom of the editing page once you have made the changes you want to make.