I am about to render my image but my render tab in the top-left corner has disappeared. ALso my save and all of those are gone. How do I get it back??
you can press (f12) to render.
you can press (f10) to get the render button to show in bottom window.
It might be that you need to click on the little triangle (shown below on the lower header for example) to get it back in top left, if so your triangle on top left will at the moment be pointing to right rather then down
if you have no header at all you need to put the cursor on the split line and right click choosing add header.
hope one of these help.