In the WAMP installation folder, there is a file named 'wampserver.ini'. Before editing it, make a backup of it in case you need to go back to it.
Edit the file and locate the section [Menu.Left].
In my file, there are three places that read
... Parameters: "[
localhost];
Change 'localhost' to 'localhost:8888' at each one. Save the file and exit the editor.
To make these new menu items take affect, you must restart the Wampserver application, not just Apache or MySQL. When it is running again, you should be able to select the localhost, phpadmin, or SQLLiteManager options with the desired port number.