To not know how to open this?

[Whataretheodds]

Beko washing machine had been leaking.
My first intention to check the filter. Shouldn't I be able to turn this by hand? Or should I need to use a wrench?!

Anything else I can do to address the leaking?

That should turn by hand.

Get hold of it and twist so the tabs line up with the slots.

I knew I'd managed it before - forget righty tighty lefty loosey.
Now running a test rinse hoping that sort the leak.