plugin[contact form 7]

Hi im new to wordpress,i’ve installed the plugin contact form 7 and i copied the code for the contact form and displayed in the page were i need it and after entering all the required datas in the user side and while sending the form its showing me an error[Failed to send your message. Please try later or contact administrator by other way.]
whether their are any backend[PHP MYADMIN] formalities we would need to do for running the contact form or any other changes i need to do for getting the details from user side to admin side