I tried out this music player from this thread https://help.forumotion.com/tricks-tips-f32/music-on-your-forums-t3508.htm (the first player) and it works, however i don't know how to add more than one audio file, can anyone help me out here?

I think that you need to upload mp3 files and then find the direct link for them and replace the one in that code with the one of the song you want to add.

I knew that my question was whether i can add more than just one file.

i dont believe its possible no.

I use www.ning.com you can create your own social network but even better its very simple to add mp3 music, as many as you like, then click the music players embed code and save to add to your forum