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how to fix an ideal standard running toilet?

I have a dual flush ideal standard toilet model K403101 purity. It constantly runs and periodically needs to fill up with water. I have no plumbing experience but would like to try to fix it myself. Is it possible? What is the first thing i should try? Which part/s should i order?
Many thanks in advance,
Fiona
Fiona Ling, April 2013
there is adjustment on water in let if water keep running

ltd, April 2013