Removing dates requires change in 3-4 template or framework files. Search for references to method mo_entry_published() should yield results. Better option would be to use the css code in Custom CSS tab in Options Panel –
I see that at present this leave the string “on” in certain places, indicating the presence of a date there. You should be able to remove these when you look for references to mo_entry_published() method. In the next update, will provide this option so that you do not have to modify the files.