updating username,password and server details

[animesh]

there is no form for updating.could you please tell how to update
username,password and server details:o:o

[Julius Caesar]

Just open the file ./config/main.inc.php in a text editor and edit the details there.

Usernames and passwords are stored on the IMAP server

[animesh]

no i have integrated with our site.i want users should have edit property to
change their username,password details.

[rosali]

How should RoundCube know how to work with your site integration? You have to write your own password script or try if some of the plugins around there (Plugin_Repository ? RoundCube Webmail) is suitable for you.