Can you link your steam curator if you make a giveaway?

When creating a giveaway you are able to write a description. In this space you are welcome to advertise your products or services, including social media channels (e.g. Facebook, YouTube, Instagram, and Twitter), games, groups, curators, or other giveaways.

In the guidelines go down to the "Advertising" section toward the bottom then it's listed under "Giveaways".