You must complete your profile before you can submit a proposal.
I complete my profile 100%, but i can't submit proposal. Kindly help me.
I checked your account, and it looks like the notification provided you the details of the profile sections that you need to complete. Kindly follow the steps provided and complete them so that you can start submitting proposals. You might want to check the following resources for tips:
You can find more helpful resources here.
Edit: Aris, I just checked, and your account should be all set now. You may now retry to submit a proposal. If the issue persists, please let us know.