How do I moderate comments, with Google+ Comments enabled on my blog?
This is a question for which there is no easy answer - and this is one of the least appreciated feature limitations of Google+ Comments.
Native Blogger commenting allowed the option to moderate comments before or after they were published.
Google+ Comments, for Blogger blogs, provides no ability to moderate before publishing. All comments must be moderated after they are published. Moderation now simply consists of the ability to declare a comment as abusive - and this ability is shared equally by all users of Google+, who are in the right Circle to read and mark any comment.
With native Blogger Commenting, you (the blog administrator / owner) could moderate comments (before or after publishing), using either email, or the dashboard Comments section. With Google+ Comments, you have no such ability - and the dashboard won't even have a Comments section, listing comments made against the blog. You can view comments made - when you are able to view them - on a post by post basis, under each post.
As the blog owner, you do not have control over all comments, published against your blog. If you allow comments using Google+, anybody who is in one of your Circles can publish a comment against your blog. If you Share a blog post to the Public - or if someone else Shares a post from your blog to the Public - and a third person comments, you may not even see the comment made, against your blog.
You cannot see comments published by people who are not in your Circles, unless the comments are posted Publicly - even if the comments are published against your blog.
For these reasons, this blog remains with Blogger Commenting.