Unless someone gives you one or you illegally download a cracked version, you can't. You can, however, try one of these free photo-shop based programs: http://funadvice.com/r/14ivnho6dm4 http://funadvice.com/r/14ivnho6t9o http://funadvice.com/r/14ivnho6v80 http://funadvice.com/r/bdttbhi6c1i http://funadvice.com/r/3jsokih1kd
Well, I don't think you get a free copy of photoshop legally, but as an alternative you could try download a programme call Gimp http://funadvice.com/r/3jseio2565 it's free, legal and a very good alternative.
picnik.com is a good place to edit photos. u can look at two of mine if u go to my profile & look at my pix. they'll be the two most recent, both of them being of my bf and i but different text on them...
You can only get a free 30day trial.