You can always just manually add it. Below the ad code, add:
There's no need for them to add the functionality when you can do it yourself, :p.
Exactly. We will be adding this functionality (and it will be easily customizable) once we have the public ad space pages done. We are working on this at the moment, which is why you are seeing changes being made to those pages. Initially however, you will still need to register/login to be able to start a campaign - but in the next development cycle we hope to add the ability to start campaigns without pre-registering - so it will be a lot quicker/simpler for new advertisers to come on board.
This is now available on the system
1) Advertisers can now browse the network ad spaces list without being signed in first (but for now they won't be able to start a campaign, until they register/sign in)
2) You can now add a link to your ad space page. Go to Publish > My ad spaces on the menu at the top and then Get HTML Code for each of your ad spaces and you will now see an option to add a link to the code.