Hey!
First find out what the BPM of the original track your working with is.
Pop it in your DAW at either the first or second bar. Put the click track on and move the voacls around until they fit to the click.
Highlight the whole track from the first bar right up to wherever it ends (bar 113 or whatever). You may have to shorten the end, use snap-to-bar or whatever to make sure it's exactly on the beat.
Make a note of the start and end bars.
Now if your original bpm is 90 - ~135, set the bpm of the track to 87 and time-stretch.
If the original bpm is 140 - 170 then set the bpm to 174 and time-stretch.
Now that you've changed the bpm the highlight/locators will have probably moved. Move them back to the bars you made a note of earlier.
I always time-stretch by "using locators" option.
Check to make sure the song still works to the click track.
The bpm you time stretch to doesn't have to be 87 or 174, it's all personal preference, as is whether you speed up of slow down the vocal.
Hope that helps.