Step- 1. How to fix this error while posting “Your Instagram account is not a business account. Please convert it to a business account to continue posting.”
Step- 2. Open the “Settings” page in your Instagram app.
Step- 3. Under the “For Professionals” section, select the “second option”.
Step- 4. Tap on “Switch to Business Account”.
Step- 5. Confirm by clicking the “Switch” button.
Step- 6. Once done, go back to “Manage Plus” and try posting the story again.