@Akvan wrote “Anicca is the inability to maintain something the way one wants it to be / or the way he likes it.” Of course of course, but it might be important to add why or why according each one’s understanding.
According my understanding it’s because such satisfaction is rooted on some level of dosa/patigha, lobha/raga and/or moha/avijja. Already here it’s “easy” to see some of the connections between Anicca and Anatta, which appear in the form of a vicious circle; an why and how dukkha is caused by both, and why and how dukkha i.e. in the form of resentment might by its turn increase anicca and anatta.
P.S. – but not every satisfaction is rooted as above; i.e. satisfaction coming from altruistic behaviours which is “natta satisfaction”.