Hi Viswanath,
In this issue, you could use WHMCS Bridge plugin, then you don’t need to edit the header and footer to match your website.
If you want to use a custom WHMCS template to match the header and footer like your website and you don’t know how to edit the header and footer to match your website, then you need to hire someone else WHMCS expert to do those based on your needs and requirements.
However, you will get the header content in the header.tpl
file and the footer content in the footer.tpl
Moreover, please learn more about our support policy (item support includes & not includes), here https://www.themelooks.com/support/support-policy/ before post a topic or ask a question.
Best Regards,
ThemeLooks Support Team