не могу понять, как

I can't understand how

→ не
phrase Rare #43,406
I can't understand how Often translated naturally as “I can't figure out how.” The subject я (“I”) is frequently omitted because it is clear from the verb form. It can introduce either a question about how something happened or instructions for how to do something.
RU: Не могу понять, как это работает.
EN: I can't figure out how this works.

Я не могу понять, как открыть окно.

I can't figure out how to open the window.

Не могу понять, как открыть окно.

I can't figure out how to open the window.

Я не могу понять, как решить эту проблему.

I can’t figure out how to solve this problem.

Не могу понять, как исчез красный Мерседес.

I can’t figure out how the red Mercedes disappeared.

— Такси (1998)