98' Clio RT Squeaky Gearbox

Hi everyone!, Can anyone point me in the right direction please?, I have a 98 Clio RT with 60k on the clock, I have a very squeaky gearbox, and the gearchange has become a bit clunky, any ideas?, where would I locate the access to top up/check the gearbox oil?, any help would be gratefully accepted....Thanks a lot....Raebeth xx:smooch: