I don't have a checkbox for "Reconcile using online balance" but I still need to change from statement to online reconcile
You want to go the opposite direction and change reconciliation from paper statement to the Online Balance? If so, you need to first set up your account for downloading from the financial institution via Add Account or Set Up Now. Once set up, then the box for Reconcile using online balance will be visible on the Online Services tab of Account Details.
This, assumes, that you are talking about a spending account such as checking, savings or credit card. Other types of accounts such as assets, loans and investment accounts, do not have the option to reconcile to the online balance.