How do I stop the water at my shower?

Interpreting what you posted into English, I think the solenoid valve may have failed or got some debris in it.

You could look at Showerdoc.com and see if there are any FAQs relevant to your shower, although you'll need to know the model (which you'd need to order spares anyway)

https://www.showerdoc.com/shower-spares/aqualisa

aahdheda
March 2018