Well, it is simple, dear Alexa fans!
"Site Tools > Edit Your Site Listing"
There (in "Edit Your Site Listing") you will see an edit listing for for your site. The information that you see below will be displayed publicly on the Alexa website.
And I think it is very useful for your SEO and for your Internet image. All you can add there is:
It's up to you which ones you will share. Then you submit it and your information should be updated by Alexa within 2 business days.
See you, Alexa fans!