In the explanation of how to participate in the contest, you make several references to "Share a post", but you don't explain what that means. What do you mean by that? Share with whom, and how, and where?
When someone arrives to this site from a URL that was generated from your logged in session, that counts as one share.
Here is my URL for this here question of yours (with an X prepended to bypass the site's link substitution algorithm)
From clicking on your users link I see that you're assigned number is 9292 so you might generate a share like
Post the link to your "link" button for the question and we will likely see the /5472 identifies me as the sharer where your user number will be different. The part before that resolves to the question itself with no credit to anyone for sharing.