Hey there Etay, not quite sure what you're asking exactly, but if you're wondering about the version of your Confluence instance, the version number is contained in the footer of every page in your instance.
If you actually want to include the version number of your instance somewhere on a page, you can access the object that contains that information in a Velocity template or in a user macro. Check out this blog post regarding Velocity objects: https://davidsimpson.me/2014/06/19/velocity-objects-atlassian-confluence-user-macro/
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