Read the documentation that came with your program to learn if it has support for MP3. If not, check to see if it has support for WAVE or AIFF. If so, create an audio CD of your MP3(s).
There are also many Shareware / Freeware programs available for audio editing and file format conversions. If the program you are using supports yet a different type of file format, you may want to look at Shareware.
Try Tucows and enter audio editing into the search.