Converting your Instagram page to become a business account is straightforward. You will have to do this on your mobile. Just follow these steps and you are officially in business.
In the Instagram app, go to your profile, and then select the menu in the top right.
Select Settings, and then select Account.
Scroll to the bottom of Account, select Switch Account Type, and then Switch to Business Account.
Now follow the instructions at Connect an Instagram account to a Facebook Page to finish setting up your business profile.