First, log into your private Facebook account (a business Facebook Page is different from your private FB account, but you access the page through your private account).
In the search bar at the top, search for your organization.
When you find it, click on it, then on the page, click the little gear next to the word “Edit” (if you do not see the gear or the word “Edit,” this means someone has claimed your page already—contact us for help). Then choose “Is this your business?”