Lastly, you need to link the Instagram account to the Facebook account through the Accounts Center inside the Instagram app.
- Tap on the 3 stripes in the upper right corner
 
- Tap on the Accounts Center
 
- Tap on the Accounts
 

- Tap on the Add accounts
 
- Tap on the Add Facebook account
 
- Tap on the Continue button
(or Not you? if the authorized account is not the one you’ve created a page on the previous steps)
 

- If you choose Not you?
 
- If you choose Use different account then tap on the Continue button
 
- Fill in your Facebook credentials and tap on the Log in button
 

- If the previously entered data was correct tap on the Continue as Username button
 
- On the new screen, you should see both of your connected accounts: Instagram and Facebook. Tap on the Continue button