When we record an interview with a digital audio recorder, or with HP, the file is saved in some format. If the file format is MP3 or WAV, then it can be opened in Audacity.
If the file is another format, such as AMR (BlackBerry) or WMA, we must convert it first, and then open it in Audacity.
I like to use a free converter program called Switch. You can download it (Windows or Mac) here.
One of the Year 2 students recommended Format Factory (also free; Windows only).
When you convert the file, please convert it to WAV format. This makes a large, uncompressed file — best for editing. After you have the WAV file, open it in Audacity for editing.
After you have finished editing in Audacity, you will export an MP3 file. The MP3 format is compressed, making a better file for the Web because the download time is faster.