A business can be claimed if there is no owner associated with it, no user id is set and the Enable Claim Business option is set to yes on general settings. If the conditions are fulfilled, a claim button will be displayed when viewing the business listing in frontend.
In order to claim a business, a business owner has to create an account and login into the account. Claiming the business is done by completing a claiming form. After being claimed, the listing will enter in the “Need claim approval” state and the administrator has to decide if the claim will be approved or rejected. If the claim is approved by the site administrator, the user id is associated with the business listing and the business owner can edit the business listing data on front-end Control Panel.