How to change "Hot Photo Portolio" on home page

On the home page, the first piece of text at the top of the page is "Hot Photo Portfolio". E.g. see nadavshier.com/ .

It appears to be an image link using

href="/index.php"><img src="/templates/hot_photoportfolio/images/logo.png"

but that image is just a couple of grey rectangles.
How do I change the text?

Thanks.

The image is actually the transparent PNG. Where it's transparent, you see gray rectangles in Photoshop or other graphic software. To edit it in Photoshop, keeping the transparent effect, do the following:

1. Open logo.png and Add a layer
2. Type some text in the new layer
3. Disable the original layer with Hot Photo... text
4. "Save as for Web" and save it as PNG with transparency enabled under logo.png name.

Actually, it doesn't have to be transparent. Any other PNG image with same proportions can change the existing logo.

That worked. Thanks very much!