how do i reset the webpage showing at startup?

Hi How to set or change your home page through the [https://support.mozilla.org/en-US/kb/how-to-set-the-home-page#:~:text=Set%20or%20change%20your%20home%20page%20through%20the%20Home%20button,-Note Home button] or [https://support.mozilla.org/en-US/kb/how-to-set-the-home-page#:~:text=Set%20your%20home%20page%20through%20Firefox%20Settings,-Click Firefox Settings]