Lokmat APPLLP 4 Pro and Whatsapp

I know it is sometimes difficult to find the right information on this forum, there is a lot on it, which can only be a good thing of course.
My problem is how do I get to the whatsapp menu on a lokmat 4.
I cannot reach the settings due to the round screen. I have been using my watch for 1 week now. Perhaps there is already a topic about it, but unfortunately I cannot find it quickly.

Press and hold the power button to enter the quick settings. Switch from round to square mode.


OK sounds very simple, Iā€™m going to give it a try. Thank you for your fast answer!