I hd tried 2 launch outlk xprs bt entrd wrong info whn it askd fr incming & outgng srver.wher & hw 2 corrct it

i hd tried 2 launch outlk xprs bt entrd wrong info whn it askd fr incming & outgoing server . Now its unable to send /recv mails . i want to correct the information since now i have the right info with me but don't know where to do to what . plz help if anyone knows what can be done abt it ;-)