Front Derailleur Wont Shift I'm not too sure what to call this but basically someone whilst riding my bike shifted up too much (basically they mustve pulled on the lever while already being in the big gear) and now as a result both the lever and the button are both jammed and I have no clue what I should do to fix it (being a novice cyclist xD) 



Usually the red line is in the middle (big ring) or to the far right (small ring). I've tried applying a lot of force to the button but it seems completely jammed. 



Lastly here is a picture of the front derailleur.
I don't have a way of knowing absolutely this is true, but it sounds like a severe case of the unnamed phenomenon where the shifter gets pushed into its (presumably) last click, and the system is set up such that this position pushes the front derailer to the absolute limit of what the limit screw and the stretchiness of the cable allow. The cable then statically has a very large amount of tension on it (much more than what the FD return spring provides, which is what the shifting mechanism is designed in mind for), and this makes shifting back take a lot of force, or in rare cases not work at all.

If this is what's going on, the main clue would be that cable has an inordinate amount of tension when you pluck it with your finger. The fix is to take a screwdriver and back out the front derailer high limit screw a couple full turns. Then you should be able to downshift as normal. After this you should ideally set the derailer back up again from square one, because if this can happen at all then something isn't quite right. If that's too much you can just reset the high limit back to the normal .5-1mm or so of chain clearance, but you might have to repeat the episode in the future, and this is one of the main contributors to STI levers failing early.