If all you have is the .png file and it's only as big as what got attached to your post - it might be difficult. Do you have the original photoshop file that maybe has a "layer" with the text in it? It would also be good to sketch up what you need: word placement, in particular. Does the "35" stay in the middle with "anniversary" gone, etc. If you don't have the original, what size and dpi do you need? Do the colors need to match what we see?
Cheers,
Rich