Now your page has been created and already published. If you want to undo this and first complete your profile, click on "Settings" above and then on "Page visibility". Select "Unpublish page". Now the page is only visible for you. You should then complete all other data of your company.

On the left you click on "About" and now you can edit all the company data.

Under "Username", you canĀ  define a user name for the page so that it is also possible to define a customised vanity URL for the page.