Put the reverb in an Aux slot in the mixer.
Feed the tracks you want to use it on to that AUX slot in the desired amount.
Set reverb effect itself to 100% wet.

That way the dry sound comes from the track, the reverb comes from the AUX slot(s) and get mixed together at the main output.

As far as a tutorial, here's one our own Mac wrote long ago, but still applies.
http://www.audiominds.com/reverb.html

The above site has many good basic tutorials on recording, mixing, etc.
Worth taking the time to read some of it if learning the craft early on.

Make your sound your own!
.. I do not work here, but the benefits are still awesome