It's in the top menu, first tab (with the bookmark), last item. If the Left-Right gesture didn't work, your multiswipe gestures are possibly turned off. Enable them in the top menu, 3rd tab (gear), Taps and gestures, Gesture manager, enable 'Turn on multiswipes'.
You can also assign it to a tap-corner gesture, if you prefer. There is no way to have a button appear automatically. (You could show it as a QuickMenu, but you would still have to do the gesture for the button to appear, to then press the button. However, you could add other options onto the same QuickMenu, if you prefer it that way.)
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