Make sure you are signed in to the account where you are an admin. Go to the page you want to add another admin to. In the upper right corner click on Edit Page.
In this list on the left hand side of your edit page your will see Manage Admins, click on this link.
Here you can see all the current admins for your page. There will be an empty box at the end of the list. If the person is a friend on Facebook start typing their name into the box.
A drop down list will appear with possible options. Click on the person you want to add, then click Save Changes.
If you are not friends on Facebook you can enter the Email address which a person has attached to their Facebook account instead. Depending on their privacy setting you may be able to add them without becoming friends.
As a security you will be asked to enter your Facebook password. This extra step prevents unauthorized people, who may have gotten access to your account, from adding admins and then hijacking your page.
The person you just added will get an email saying that they have been added as an admin to your page. With the new Facebook page settings they will also start receiving emails when people interact with your page. My next blog will cover how to turn off these emails and why Hyper Alerts is a better service for receiving news on page activity via email.
Admins will remain confidential unless you choose to add a “featured owner” to your page.