After putting in WordPress, you’ll gain access to your website’s admin dashboard, wherever you've got the chance to line up your website as you wish and alter some things. This would be not possible if you had no access to the admin pages. The login page is what keeps you and others from accessing the management “side” of your WordPress website. WordPress Login
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Here's how you do it.
Navigate to your WordPress login page. Your backend WordPress login will be your domain name with /wp-admin added to the end of it.
Enter your WordPress username and password.
Save your login credentials.
Customize your site.
Change your theme completely.