how to resize photo?

There are many areas which photos are displayed. Can you be a bit more specific on the exact location you want to alter the photo size for.

if you look in the admin panel click on settings advanced settings you should see the values for some of the photo stuff. not sure if thats what you are looking for.

Max width of profile icon (in pixels)
Max height of profile icon (in pixels)
Max width of profile thumbnail (in pixels)
Max height of profile thumbnail (in pixels)
Max width of profile photo (in pixels)
Max height of profile photo (in pixels)