How do I flip the freaking rear brake up? F800GSA standing vs sitting rear brake

[Pepsie]

Another post

How do I flip up this rear brake flip thingy? I pressed in the side button but I can't move it at all.

(The stand up vs the sitting rear brake)

 

[siwhite]

The whole of the stainless extension slides backwards against the spring and lets you fold it up or down.

 

[Pepsie]

The whole of the stainless extension slides backwards against the spring and lets you fold it up or down.

wow I think I may be an idiot