To change your company name you will need to be logged into your dashboard.
On the left-hand side of your dashboard, you need to click on the Get Found (SEO) section.
In this page, you will find a section titled Company Name. Change the details here and click Save company name.
If you are unable to find this due to the use of Flint, pick a page that hasn't had Flint attached to it and you will see the Company Name. You should see the old name in there but you can update this to the new name and will will work across all pages.