Do not use the Website Builder buttons in the client area. Those lead to our website builder. If you already have a WordPress website and want to keep using WordPress, then don’t use the website builder, because it’s a different way to build your website.
I checked your website, and it seems that the wp-admin page is not available because you specifically chose to make it unavailable.
When I check the Network tab in my browser and navigate to the wp-admin page, I do see the response header X-Redirected-By: WordPress. Meaning WordPress is running there.
In the list of plugins you have on your website, I see you have the WPS Hide Login extension. This is probably what’s hiding the WordPress admin interface.
Please try disabling the plugin by going in to the wp-content/plugins/ folder, and renaming the wps-hide-login folder to something else.
While I checking your site, I also noticed the .htaccess file of your website was missing.