Cheat Engine

[False Prophet]

How can I add a string to a compiled binary using Ollydbg?
I am trying to write a patch that compares two strings to one another. Problem is I don't know how to reference or whatever it is I need to do to add the string to make the comparison.

I don't understand how to resize data sections(if that's what I need to do) using Ollydbg or however I would do it.

Can someone provide me with some insight on this?

[atom0s]

Check out CFF Explorer for PE editing:
http://www.ntcore.com/exsuite.php

[Kavvman]

You don't need to really re-add sections if what you're trying to do is simple string comparison. You can find yourself a cave/empty spot in the exe and use that for writing your string. Or you can dynamically allocate memory and use that as your cave/place to write strings. You can also do the comparison there.