Go to the “My businesses” screen (On a mobile/tablet click on the dropdown menu on a desktop you will find the menu in the left column. In the menu select “My businesses”.
Write in the top search field at the top corner the name of or the ID of the business you are searching for.
When you click on [Add], a request will be sent to add other users who work with this business.
After approval by a user, the business will appear in your list.