Answer:
Digital white-out.
What begins with an E but only has one letter?
I have an eye, but I can't see. I usually have to work with something in my eye. What am I?
First I may be your servant's name; then your desires I may proclaim; And when your mortal life is over hold all your wealth within my power.
There is one in a minute two in a moment and none in a thousand years. What is it?
No matter how little or how much you use me, you change me every month.