Step 1. Log into PetCloud.

Step 2. Go to your Listing page: https://www.petcloud.com.au/listing

Step 3. Click the "View Listing" aqua button

Step 4. Highlight and copy the URL (using the Ctrl C buttons)

Open up facebook in a fresh browser tab, search for a group you want to join or have joined, and then Paste (Ctrl V) your URL into the discussion wall of the group.