Instagram only allows scheduling posts from Creator or Business Instagram accounts. Before connecting your Instagram account to Postpone, you must first convert it to a Creator or Business account.
Creator Instagram Accounts
Creator accounts are best for individual content creators. To convert your Instagram account to a Creator account, follow the steps in the official Instagram guide:
How to set up a Creator account on Instagram
Business Instagram Accounts
Business accounts are best for businesses and products. To convert your Instagram account to a Business account, follow the steps in the official Instagram guide: