Can't Unstake XTZ

I would like to unstake so I can choose to stake to a new Baker. It won’t let me enter an amount to unstake, not even the max amount. It also shows a subheading ‘Validator’ and under that it says Apr 6.08% Decommissioned. What’s happening here?
Baking Bad shows that I am successfully staking to Tezosteam. And if I select the Stake option it lists just one Baker, moneyin3days. Weird.

You can just directly stake to another baker. No need to unstake.
The amount will always be max. It is further explained on the guide: