Add an Instagram page to your account
Go to settings, Social Media Channels, Click "Add More Pages"
Step 1: Access the Settings panel
Step 2: Go to the "Social Media Channels" tab and click "Add Instagram Accounts"
Step 3: Click the plus sign
Step 4: Click Add Members and choose who should get access to the page. For detailed guide on how to give Members access see this page.
EXTRA:
To add a X page find detailed guide here.
To add a Facebook page find detailed guide here.
To add a LinkedIn account find detailed guide here.
To add a Facebook Ads account find detailed guide here.