The platform does not have the ability to publish to your Instagram feed on your behalf. You will have to log in to your account on a mobile device to publish your approved content.
Publishing Your Instagram Post From Your Mobile Device:
Step 1: Find the photo on your mobile device. It should be the same photo you see in the Post Preview section. *Do not add any filters, emojis or resize your image at this point. If you do, your content will fail verification.
Step 2: From your mobile device, select and copy the Marketer approved text. Your post's caption must match or it will not validate.
Step 3: Using the photo and caption from above, submit your post to Instagram from your mobile device by tapping Share.
Step 4: Once your photo is posted to Instagram, click the "..." icon above your photo and select Share. Then, once back in your account, paste the copied URL in the box provided. Hit "Submit" once you are done.