To edit an AJAX panel state (not its content), follow the next steps:
Go to the master page if you are not there (but editing a certain panel state) as shown here.
Notice in the Server Behaviors tab of the Application panel the existing AJAX Panel server behaviors, one for each panel.
Double-click the one that includes the state you want to edit.
In the dialog box that opens, go to the third tab (States).
You cannot change the name of the panel state.
You can change the content file, and for states of the main panel, you can also change the title, meta description, and meta keywords.
To edit the content in a panel state you have to access that state first. You can do this in three ways:
Click the Edit Panel States icon in the MX AJAX Toolbox tab of the Insert bar.
Use the options corresponding to the AJAX Panels item in the right-click contextual menu.
Select the state you wan to edit in the AJAX Panels window/floater.