Regarding signature

[rakib]

signature is not working here. Please let me know the reason.

Actually they work fine. You just don't have them turned on in your User CP.

For anyone else having difficulty with Signatures this is the section where you need to switch `on.` Edit Options

Visible Post Elements
You have the option to show or hide various elements of messages, which may be of use to users on slow internet connections, or who want to remove extraneous clutter from posts.
Show Signatures
Show Avatars
Show Images (including attached images and images in [IMG] code)

Thanks for that TeamPlayer