The comment form was acidentally hidden in the CSS in V1.0 of Ophelia. To correct this locate the following section of CSS in the Ophelia stylesheet:

/*Single post styling*/

.et_post_meta_wrapper  {
    display: none;
}

And replace with this:

/*Single post styling*/

.et_post_meta_wrapper h1,
.et_post_meta_wrapper p.post-meta,
.et_post_meta_wrapper img {
    display: none;
}

This error is fixed in V1.1