I just checked your account and it has already been accepted and you have already sent one proposal for the job. Please, make sure you check resources in this post to help you get started and let us know if you are still experiencing any issue with sending proposals.
Thank you or reaching out to us. I've followed up with our team regarding your concern, and your account is accepted now. Feel free to select a membership plan and start bidding on projects. You can also check out this thread Getting Started on Upwork and learn more about Upwork. Thank you!