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Welcome to JA, sorry to hear you are having concerns regarding PAT testing.
Your PAT tester will fix the sticker so need not worry, where to place the sticker and how to log the appliance details and test result in the ledger will be covered by the person having completed the appropriate training.
Typically the sticker is placed on the plug but where the plug or cord is detachable (for instance a TV or computer) then a stick is placed on the plug (as the plug \ flex is tested independently), and then another sticker on the appliance itself normally located to the rear where the plug fits into the appliance.
Do let me know if you need anything clarified.