If you really thinking that you don’t wan to display Written by information in your blog or your are the only one person writing on the blog, then there is no point for showing written by line in each post. Well, You can change or remove the text ‘written by’ displaying under default wordpress installation. Here is the easy way to do that.
Go to Appearance edit and select index.php template.
<?php the_author() ?>
Change the written by to some other text.
Save the index.php file. You are done.