Watch the Melodic Minor Substitutions online guitar lesson by John Stowell from Modern Jazz Improv
Utilizing tensions over the dominant chord to create resolution requires a bit more homework on the fretboard. A good place to start is with the basic dominant 7th moving to a dominant altered, resolving to a I chord. Connect your ideas slowly and deliberately in the beginning. The ability to transition from one fingering to another and develop some melodic sensibilities will come with time and practice. If you have enough bars to work with in a progression, remember that you can also combine a melodic minor a half step above and a whole tone below a dominant chord with major arpeggios in the same two keys (i.e., C#major/melodic minor and Bb major/melodic minor over C7).