You can search a particular Ad using the Ad reference number. Alternatively, if the Ad has been previously saved or reviewed, it'll appear at the bottom of your ClickBD homepage.
You are allowed to mail the buyer with regards to any doubts or query that you may have about the product on the Ad. Spamming the sellers email address or sending out other promotional adverts using this mailing facility is strictly prohibited and can result in your account getting blocked or barred.