Hi,
when you go to the module settings you will find 'Your Slides' section. When you edit slide you will see 'Title' option. Here you ca nedit it and then you need to save your changes. If you want less slides just remove unneeded. But in your cass if you would like to have one slider I advise publish Image Show GK4 module in header position. If you don't want switch sliders you don't need GK Tabs module.