The easiest way would be to use a B or B7 chord right before playing E.
For an E major chord you simply need the tonic, the third and the fifth. Those are E , G# and B.
The relative major of E minor is G major.
First, you must figure out what note you need. Say it is an eighth note. Replace the head of the note with the fingering number. That's it!
The tonic of E flat major is E flat. Its dominant is B flat and its subdominant is A flat.