WordPress Website Templates
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The theme is coded to display slider only on homepage. You can’t use the default homepage slider on other pages.
If you want to use the slider in sub-pages, you can use any slider WordPress Plugin and it will also need to some code changes in header.php file.
If you want to do so, you can send your website URL and WordPress admin login details at firstname.lastname@example.org so we can check and solve your problem.