Something else that may be more helpful in understand modes is practice in hearing them.
If you sit down and play along with a single note, let's say good ole middle C, walk up and down each mode using C as home. Make up melody as you go. Not flailing guitar solo's, just simple melody.
IE. C major (tonic), C minor (dorian / Bb major), C minor (phrygian, Ab/G# major) and so on and you'll begin to hear the tonal qualities of these modes with practice.