Full cd in 1 file

I have downloaded an cd as a single file mp3. When I burn the cd it burns as 1 track. How do I burn the file so that all the songs seperate into there respective tracks?

You can do so bu using Feurio and setting the tracks manually.
You can edit the file in a wave editor and split it up in several separate files
Or you can use a cue file you create yourself and burn that with Fireburner or CDRWin.

ALl above mentioned alternatives have been discussed many times before, so I would advise you to use the search

Search for ‘CUE AND create’ or ‘CUE AND Create AND mp3’ to narrow your search.

Read advanced topic in cdrwin(org)how to write a cue sheet to burn the cd with multiple tracks instead of 1.