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@lesimi: To hide poster and posted date, you can add the following css in “Appearance => Theme Options => Custom CSS” Box:
.entry-header .entry-meta { display: none; }

The easy way to remove comment with single click is only there in Pro version. In free version, you need to go to “Settings => Discussions” and remove, see this screenshot https://www.pinterest.com/pin/548594798333127973/, this will remove for all new posts and pages. But for old pages/post you need to edit it individually or block using https://www.pinterest.com/pin/548594798333128024/

@lesimi: Ok so you want to remove both then replace the previous css with the following:
.entry-meta { display: none; }