Do you have a handbook or manual for the bike? That'll show you how to do it - fairly straightforward really. If you have a toolkit for the bike as well it would help, that'll have all the right sized spanners in it. is there anyone around your way who could just show you how to do it or instruct you in doing it? There may be a sticker on the swingarm stating what the recommended chain slack should be, it's normally around 30mm of play - shame you didn't ask last night, we could have shown you how to do it :
Good luck, keep asking on here if you have any further problems [smiley=thumbsup.gif]