Step 2, in search type in the address you want to check transaction history for. In this example I typed in "Bitcoin Address" in google and copy/pasted the first one I found. 1F1tAaz5x1HUXrCNLbtMDqcw6o5GNn4xqX
Now if someone has a wallet and is constantly changing addresses with each transaction, that is something that I am unfamiliar with as I don't buy/hide stuff online with BTC.