Step 1: Access the campground via the sidebar menu and select edit campground and then the 'Managers' tab.
Step 2: Above the list of managers click the green + button.
Step 3: Type the manager's email into the search box that appears above the list. If the manager has been setup previously they will appear in the drop down list. If you don't see the manager appear select the 'Create New Manager' button.
Step 4: Input the managers user information filling in all the boxes highlighted in red. Email, first name, last name, and phone number.
Step 5: When all fields above in red are filled out the save button will no longer be grayed out and you can click it to finish saving the manager profile.
You will now be able to see the new manager included in the list of campground managers.
After you have added the new manager make sure that you hit save at the bottom of the campground page, otherwise the manager will not be added.