Hi there and welcome
nice try on the skin, there is a couple of things that you need to improve in my opinion. One, you need to definetly work on a better navigation system, your navigation and main links are very scatterd around and could cause confusion to your new members/visitors, not mentioning that it covers a lot of space, almost one/half of the whole window. And maybe try to redo the header and adjust the size of it to the width of your forums,
good luck