What exactly do you want to do? Do you want to Make Firefox your default browser so that all webpages you open on your computer open in Firefox? If you want to set the home page, first navigate to the page you want to set as your home page and then follow the guide How to set the home page - drag and drop the tab onto your ⌂ Home button or go to Options → Home, where you can set the home page as well as new tab behavior. You may also want to Customize your Firefox New Tab page.

Reply if you need more help.

Hello,

did you mean startpage or a link at your homepage?

Here are the preferences for your startpage when opening firefox... (see appendix)