In many cases, you can. However, some platforms have restrictions on certain songs due to licensing and copyright issues. So, it's not always possible to use just any song you want.
It's quite simple. Just open the app where you want to add the song to your story, look for the option like 'Add Music' or 'Select Song', and then choose the song you like from the available library.
To put a song on your story, first check if the platform supports music integration. Usually, there'll be a feature like 'insert song' or something similar. Once you find it, browse through the available songs or upload the one you prefer. Just be cautious about any copyright restrictions.