Open the music player software on the computer. Import the MP3 from an external file or CD-ROM by selecting the "File" drop-down menu, and then clicking the "Import" button. In the "Import Music" sub-menu that appears, select the location of the file and click "OK."
Allow several minutes to import the MP3 (depending on the size and quality of the MP3 this may take up to 15 minutes). Wait for the music playing software to open the tagging menu after the MP3 is completely imported.
Fill in the information for the MP3 in the tagging sub-menu such as name of the song, artist and style. Finally, add the name of the record label of the MP3 and then select the "Apply" button.