Don't worry! It's very easy to add music, sound or any audio files to FlipaClip animation. Follow this link
Would you mind being slightly more specific about the problem you are having so we can better understand how to fix this? Please elaborate a bit more what is happening when you try to add audio. Do you have any error message? Does it import file successfully and you cannot play it after that or you are not even able to import file?
Customer support service by UserEcho