How to change black/white to play without reset all the config ?

Hello,

I don't know how to change only who start to play, without reset all the configuration of the board

https://www.chess.com/analysis-board-editor

Thank you

If you click "Set up Position", there is a dropdown list box which gives the choice "White to Move" or "Black to Move".

I mean, after you set up the position and launch it, and you want to change white to move to black to move, without reseting the position and put the pieces again

The FEN is displayed in an edit box.
You could try modifying the FEN string by switching the 'w' to a 'b' or vice versa. 

I have a similar problem, I noticed that some time ago all puzzles instructions changed to "White to move" despite setting "Black to move" (even old posts changed - before there was Black to move), example from my blog:

It seems to be set correctly, yet the published post shows 'White to move':

The puzzle works fine - you have to move Black, but the auto caption says 'White to move' anyway. I think it's a bug or some script issue. Thanks for help in advance.

How do I switch the host from black and white to just one?