If your website doesn't have MLS® Reciprocity, or you simply want to add a new listing manually you just need to do the following.
2.- Click on "Add New Listing".
3.- It will take you to this page, then click "Manual Entry".

4.- Time to Add the Information
The image below show you the information that you have to complete. For example, on "Address" tab:
1. Click on the "Rent or Sale" and choose an option if available.
2. Add the Listed Price"
3. Click on the "Sale Status" button and choose one the "Sale Status" (Active, Sold/Rented, Show on Both)
4. Complete the information of your new listing into the boxes shown below. For example, the one labeled "Address of Property".
5. When you finish to complete all the info, click on "Find Address" to add it on Google Map.
5.-Keep going into the rest of the tabs ("Basic Info" "Details" "Dimensions") and fill out the information.
6.-Update your Listing
When you complete all the information about your listing, click on "Update This Listing" and voilà! you are done.