Getting rid of the tags/categories etc & moving the date is easy via custom css:
For the tags, etc to disappear:
.post-meta { display: none; }
If they still don’t disappear, change it to:
.post-meta { display: none!important; }
For moving the date:
.post-date, .post-title { display: inline; }
.post-date { padding: 5px; border: 1px solid #000; }
The inline is to get the date & title side by side. The padding & border is just an example of a simple box for the date.
You can use the theme’s custom css area but it’s a pain to work in it. I highly suggest making custom css changes via a child theme. If you add/modify the theme’s files directly, they will be overwritten in the next update to the theme.
Change the date format via the WP settings, not through the theme.
Moving the thumbnail can be done by modifying the loop. I think this should definitely be done via a child theme AND with a test site first AND with a really good backup system in place. If you mess with php files, you risk breaking your site completely.
If you are not familiar or comfortable with reading code, you probably shouldn’t be messing with the loop. If you want to dare anyways, try the following:
In the child theme loop.php (seriously, don’t do this in the main theme file), cut these 2 lines AND everything between them (this block of code contains the call to the thumbnail):
<?php themify_base_before_post_image(); // Hook ?>
…more lines of code…
<?php themify_base_after_post_image(); // Hook ?>
then paste it all to underneath this line (which marks the end of the title coding):
<?php themify_base_after_post_title(); // Hook ?>
but before this line (which calls the rest of the post):
<?php if ( ! is_attachment() ) : ?>
