well mine is a premade layout, as i tried to do my own layout and i wasnt succsful either, so you can go to 'my mibba' then to 'css' and then you must have something that says 'click here to choose one of our pre made layouts' and well you click there :D if you dont want a premade layout then im no help either XD
ahh i know how you feel, i was new here exaclty one week ago :] though if you need help tell me eheh then we can wonder about the same problem together jkk :D and i am replying to mibba comments, got nothing better to do, which is actually pretty sad O.o