How do i?

how do i download the song from notessimo to my computer?
because when i click save as nothing happens
please help!

You have to use the converter, which you can download from that link. Share your song, and put the link to it in the converter and convert it to WAV.
If you just wanna save your song on your browser and not download it, go to ‘Save’ and pick one of the slots, just be sure not to erase your browsers cache or cookies or what ever holds the save file.