Help – Home Page Editor has Disappeared!

I am not sure what has happened but I edited my homepage 1/2 slider and tried to add a link to one of the sliders. I can only assume the theme didn’t like the link as the slider image has now disappeared from the home page (replaced by a picture icon) but more worringly the facility to edit the home page has also disappeared from home page set up, even though home page editor is still enabled, so I can’t rectify this. Please can someone help??