How to use the Tabs module? I've installed the Tabs module, but I don't know how to use it.

Can anyone help me, please?
I guess you're talking about tabs

As it is written on the page : 


  The tabs module integrates the jQuery UI tabs plugin, providing client-side interactive tabs. This is a helper module. It doesn't do anything on its own. Rather, it is used by other modules that provide tabs.


If you are not a coder, don't use this module.
If there is not any module that ask you to install this module, don't use this module.

If you want some tabs to break long pages into smaller ones, have a look on paging module.

If you just want to add some tabs like "Views," "Edit," etc on nodes, this is handled by core code; have a look to the API, especially hook_menu().