If you have administrator permissions to the account, you can easily change your company name and contact details by clicking on your username (on the desktop, it is in the upper right corner) and selecting "Edit <your company>'s profile".
Once you click on it, you will see two tabs: "Company Information", where you can modify the name, descriptions, contact information, logo, and other fields, and "Page Design" where you can change the appearance of your page and add multimedia content.
Keep in mind that after changing the name of your company the URL does not change automatically. You can send us an email to email@example.com requesting us to update it. The processes created before the edition will remain with the old URL.