When you have an administrator account, you can sign in to the Google Admin console. Administrators can manage Google services in an organization by logging into the console. Also, you can do a G Suite admin login to user account if you have administrator rights. The G Suite Product Page can be accessed using any web browser by simply visiting www.gsuite.google.com/, which will open any browser and direct you to the G Suite Product Page. Next, enter your administrator account email address and password. Then click Next. Finally, click Sign in. The screen will now look like the following, and you will be signed in to your account. see also -

Why G Suite not Receiving Some Emails