Hello,
Thank you for contacting us.
1. We just visited your website and see that it is already displayed as on our demo. Unfortunately, there is no zoom image feature for blog posts in our theme.
2. Actually, admin id is not showed on your blog pages. But you can hide its name by placing this code snippet to the Custom CSS area in Theme Settings
li.meta-author {
display: none!important;
}
.type-post .entry-meta li:before {
display: none!important;
}3. You can use this plugin to disable comments on all posts
https://wordpress.org/plugins/disable-comments/
Regards