I cannot get my rewards from backing on Indiegogo

Can somebody help me with my problem? I’m trying to get my rewards from my backer page but it says:

“You did not link your Steam Account. Unfortunately, we cannot give your rewards to you. Please contact us for further assistance.”

I don’t remember being told to link my steam account. But I did get my Units from GMod Tower transferred over. I’m not quite sure what to do.

There was a sticky post a while back, as well as emails sent out to all backers reminding them to link their account before a set date.

PM a developer, like @macdguy and ask for help.