Instruction Leaflet or Help with Alarm Clock?

I have a Constant LED Alarm Clock ( a href="http://www.homebase.co.uk/webapp/wcs/stores/servlet/ProductDisplay?storeId=20001&productId=1500538753&langId=-1&cmpid=AFPFD&_$ja=tsid:18771|cc:|prd:2550431|cat:Home+Enhancements%3EClocks" rel="nofollow"http://www.homebase.co.uk/webapp/wcs/sto…/a ), quite old.. still works fine and everything.. I lost the user manual and i cannot change the time!! I can change the alarm, just not the actual clocks time, help! Thanks :)