Yes, you can make as many alterations to the same property listings as you need at anytime.
Log into the site and you will see a Dashboard of how many properties you have created. On the left you will see a drop down with “Add or Edit My Properties Here”.
Your properties will be displayed on the right hand side, underneath the property you want to adjust you will see a panel that says “Edit”
There are no fees to edit a property at anytime.