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The Auto sub-tab is inside the Planet tab (same tab as your actions and building). Tap Planet → Auto and you'll see a toggle for the Assembler — switch it off to stop it crafting entirely.                                          

Alternatively, if you want to keep the assembler running but just switch what it makes, go to Planet → Craft and tap a different recipe to set it as the active one. 

Good luck on your journey :)

Sorry about that — just pushed a fix. Reload the page and the Auto sub-tab should be back under Planet. If it's still missing, try a hard refresh (Ctrl+Shift+R /Cmd+Shift+R).