The 3DS Max Render to Texture Destination dialog is accessible from the OgreMax menu:
This dialog allows the '3DS Max Render to Texture Destination' to be set for the OgreMax materials of all selected objects.
For more information, see OgreMax Technique/Pass '3DS Max Render To Texture Destination'
For a tutorial that uses the 3DS Max Render to Texture Destination dialog, see Create Light Maps with the 3DS Max 'Render to Texture' Feature.