I have clicked buy now accidentally can I cancel transaction

 
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if you do click buy it now accidentially.. then you just back out and DO NOT click the CONFIRMATION button

 

however if you clicked buy it now, and then clicked CONFIRM you have actually purchased the item and you need to pay for it or contact the seller and see if they are willing to let you cancel the transaction.  if they do not then you can get a strike against your account for non payment

if you get 2 strikes for non payment you may find you cannot buy much on ebay as many sellers block non payers

 

ebay have a 2 step buy /  confirm so that you cant accidentially buy