I had a look, they provide you the codes you need to embed. Go to one of your photo pages (a page displaying a single photo) and click the photo. It will show you a menu including an option to "link to it". Select this option and you'll see that the codes it gives defaults to a tiny thumbnail, but you can select "600". There it will display you three different codes. The ones you can use are the second (you'll have to add img bbcode tags) or the last one (already has bbcode but also adds a link to their site).
Yikes! I only now noticed that the feed of you Flickr pics on your a2k profile does not respect the Flickr filters. So this is a heads-up: if you add your Flickr username to your A2K profile, be aware that all your photos will show up here - also the ones you designated as being visible only to "friends" and/or "family", which don't show up for the public on your Flickr...
