How can I keep that useless drop down box from appearing every time I visit RC U? It is unnessesary and of no value to me!

Which useless drop down box are you referring to?

The one that wants me to hoose my universe. Airplanes, cars, boats etc. It asks everytime I go on RCU.

It will always ask if you:

a) delete cookies between every visit.  it does not know you answered it if you delete your cookie

b) are not logged in.  if you are not logged in it will show you the box since it cannot determine from cookie or login what you want to see

the box tells the servers if we should show you content for cars, planes, boats, helis, electrics, airplanes or everything.  Like your own custom site