hi there, im not too up on Photoshop Home but i assume its got more support for web publishing. The way i would solve the 'white box' problem would be in one of two ways. If your logo has clean edges you could cut and paste it onto a transparent background, and then export as a GIF with transparency turned on (Save for Web). Alternatively find out the hex code of your page background colour from your web layout program (should be something like #333FF) and fill the background to your logo with the exact same colour (in the colour screen theres a space provided for the hex code). This should sort your problem.
If you still have trouble matching the colours exactly, fill the background of your logo with the colour you would like the background of your page to be. Then take a 1X1 pixel section of this colour and save it as a gif/jpg. Then instead of setting a background colour on your page, simply select this file as a background image and it should tile to fill the whole page with the colour. Hopefully it will match exactly with the background colour of your logo.
Hope this helps! Nick Price
nick.price@misuk.net