how the hell do ya climb the ladder in lach vaan on the bottom of the well ive searched it all and some parts r blocked how do i get out

Press the X button to bring up your action menu.
Now, at the top left part of your screen, there should be mini-icons depicting firstly; your environment, and secondly; anything else that's in or near your current location; such as monsters, treasure chests, traps, doors, ladders, obstacles, etc.
Use the left/right part of the directional (non analog) pad to cycle through them. Highlight the ladder and press X again to use it.