On the new site, you have full control of your postings if you want to sell or rent your share. Do remember that anyone who sells or rents your share must live in Briarcliff.
Once you have logged in, you can create an offer to rent or sell your share by clicking on the appropriate menu on the top menu bar:
Fill in the form presented, save it, and it will appear in the Shares for Sale/Rent link.
You can and must maintain your listing. You can find your posting using the "Manage my content" link in the Navigation menu. This will list everything that you have authored. Click the posting to edit it or to delete it.