Here are the steps to post a collection on the Artfire forums:
Step 1: Go to My Artfire, scroll down at My Collections, click on Manage collection
Step 2: When on Manage collections, choose the collection and click on the title
Step 3: When the collection is open, scroll down at the left hand side you will see 5 links, click on 'EMBED COLLECTION IN A WEBSITE'
Step 4:Choose a widget background color and choose a widget size, and see the PREVIEW
Step 5:Highlight collection