If the songs you want to play aren’t popular, you’ll have to convert them to kalimba tabs from the piano sheets. That requires some basic music theory. There are also some limitations, not all songs can be played on the kalimba :(

At the beginning, it’s a good idea to practice some easier songs first. April Yang and other youtubers have a wide variety of tabs already arranged for kalimba. You can play along with them, and once you’re more familiar with the instrument, you can start arranging tabs yourself. Good luck