kostuj, keep in mind the theme and its use of Template Tags define what is or is not displayed on your blog.
Getting the author name to display is fairly easy. The default theme's index.php includes the template tag for it, the_author(), but it's commented out. Look for this:
<small><?php the_time('F jS, Y') ?> <!-- by <?php the_author() ?> --></small>
and remove the HTML comment tags around the_author() to get it to display:
<small><?php the_time('F jS, Y') ?> by <?php the_author() ?></small>
For archive.php and search.php, you'll have to add it. So look for this line in those templates:
<small><?php the_time('l, F jS, Y') ?></small>
and replace it with the one I have above.
The time, which is normally displayed with the_time(), is a little more complicated since as you see from the lines above the default theme uses this tag but with a format string ('l, F jS, Y') to display the day and date of a post, but not the time.
The reason the default theme uses the_time() this way is the_date() is typically used as a header for a group of posts: it only displays once a day, so if you have more than one post that day, it would not show on the second post (and third, and so on). You can, however, add the time to the format string:
<small><?php the_time('l, F jS, Y @ g:i A') ?></small>
Which would show up as:
February 4th, 2006 @ 2:54 AM
<small><?php the_time('l, F jS, Y @ G:i') ?></small>
You can learn more about date/time format string characters here:
(WordPress' date/time tags use the same format method as PHP's date() function.)
Finally, on that name............
Not hard to see why you took it for Polish, what with 'Kafka' sitting so heavy on it. But no, Kafkaesquí -- accented flair at the end -- is in part Hispanic, though mainly it's a name placed upon me with the intention of providing something totally, and unrelentingly, unique.
I ask everyone to call me Kaf (K is fine too), but I register with Kafkaesquí (or its ASCII equivalent) on boards such as this because there is no chance on earth anyone signed up with it before I have. Unless they're insane.