Bots spamming posts throughout the global feed plagued Hubski for months. Instead of manually removing accounts, a system was put in place to prevent the former.
Ways to create a post as a new user:
1. Complete one full circle-dot (or wheel, located next to your name in the top left) and earn your first badge.
2. Receive a badge from another user.
3. Get promoted/vouched for by a user that's met the above requirements.
I've done that latter for you. You can now post.