Hi Andrej
It is wonderful that you want to support Bhikkhunis 
!
These are many Bhikkhuni monasteries/ sanghas / organizations around the world, and I am sure there is one close to you.
There is a thread here on D&D, and the list may have grown by now (
) so I welcome anyone to add to it,…
For the latest, most comprehensive list please see…
May much merit come to you 