need advice to remove the stem

[Reg For Gif]

Please advice on how to remove the stem of the movement (see attached photo). Thank you!

 

Edited September 1, 2019 by Reg For Gif

[Toadtorrent]

Your picture makes the button look look weird, but unless your movement is really weird, using the pin end of a springbar tool, you should be able to push the button circled here while pulling out the stem:

[Dochere2]

edit

Edited March 9, 2020 by Dochere2

[SSTEEL]

It's actually to the lower left of the drawn circle.

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[Nexus9]

A little late to the party here, but it should be noted:  press lightly on the button at the same time you are applying light pressure (pulling) the stem.  The idea here is to press the button just enough to release the stem - normally, less than 1 millimeter.  Too much pressure on this button will mess up the keyless works on the other side of the main plate, and now you'll be removing the face and the datewheel etc to get to that.