See the Set a Static “Home” Page (Front Page) support page. You already have a default “About” page published. That page may be chosen as your front page at Customize > Homepage Settings > Homepage, and edited as you like. Or you may created another page titled “Home” or whatever you like that you may select as the front page. Also, if you haven’t already done so, then you should publish another page that may be set as the posts page.