The Comment (also known as Post) base type is specifically for user-contributed Comments, and a Comment is a content item of the Post type. The Comment base type is unique in several ways. Most importantly, you cannot create a new, extended (specialized) type from the Comment base type. When you edit the Comment type, you are editing the single content type on which Comments in your site will be structured.
The entry form for the Comment base type is the equivalent of a standard Properties step in other base types. It serves as the Add Comment submission form used by site visitors. You edit this form just as you would a standard Properties step. You can make a variety of other edits to the Comment base type as well, such as editing its label and description and creating additional list templates.
Remember that you are editing the single content type on which Comments in your site will be structured.
The Comment base type differs from the other base types in the following crucial ways:
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You cannot create a new extended type from the Comment base type. The base type is the only content type from which Comments are created, and any changes are to the base type itself.
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The Comment type starts with its own default, out-of-the-box list template. You can create additional list templates as needed. (There is no need for a single display template. Comments are only displayed in list form, based on the list template selected for the Comments List component.)
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The Comment base type does not have an Authoring Wizard. The only way to create a Comment content item is as a Comment, submitted by a site visitor by means of the Add Comment submission form. You edit the Add Comment submission form by editing the Fields on the Comment base type administration page. (The submission form is essentially the equivalent of the Authoring Wizard Properties step, except that it is completed by a site visitor rather than an internal administrator.)
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Comments (content items of the Comment base type) are not saved in folders or accessed as individual documents like items of other base types. For instance, there is no List All link from the Comment base type administration page. Comments are viewed and processed on the Comments tab, in My Comment Approvals or All Comments, or by a folder Manager on the Properties tab of the Comment's Status page. (Published Comments can be viewed as a list on a live Web page.)
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A Comment is only editable by the site visitor when he or she first creates and submits it. From that point on, the Comment remains as is.
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An individual Comment cannot be deleted, even if it is rejected by a folder Manager or a Website Administrator. It remains in the database. However, deleting a Web page, display template, or wrapper that contains an Add Comment Form component -- and from which Comments have been submitted -- also deletes all Comments associated with that component.