My new account of 2 months. I have some PNG images uploaded and approved. But my submit option is off for last 1 month. Please help.

Try using another web device that doesn’t have script blockers. 

Or clear your browser’s cached data & cookies. Ask Google for specific browser details.

New accounts have weekly & maximum submission limits. The limits vary based on your sales history & acceptance rates.

• Weekly limits reset in 8 days.
• Maximum limits reset when your pending assets have been reviewed.

If you think this is a technical issue, reach out to the Contributor Relations Team from the link in your Contributor portal.

Hope that helps.