How do you "press the action button"?

[Cat tit bingo]

I just want know how to climb a ladder and all my superior says is to "press the action button", what does that mean, I don't see any buttons.

 

[Neodanthril]

You have to plug your controller into the second port

 

[Not an Hero]

"Action Button" is what your dad calls his prostate. Don't worry, he'll walk you through it.

 

[Soup Sammiches]

You have to hold the Any key or it won't work right.

 

[urr13 account]

Probably either A or X depending on your controller

 

[Sparkletor 2.0]

That's an error in your superior's dialogue text. You press 'up' to climb.