If you select on ID, the explorer will take you to a section where you can find all information regarding the transaction including the transaction hash, which is a unique string of characters that is given to every transaction that is verified and added to the block chain. In many cases, a transaction hash is needed in order to locate funds.
On the search option on the top of the dashboard you can use the search box, then select search transaction hash and add the unique string to locate the transaction that took place