I created site for my company based on WordPress and used front page for some company related information. I need blog as well so created additional page for that, but cannot blog on it as on Home/Front page of wordpress, because it dont allow you to create posts within page, only edit entire page.
Under Settings > Reading, you can set your front page to be a static page, and you can set another page that you've created to be your posts page. Then when you write a new post, it will show on your posts page.
Sound like you want to set "Front page displays" back to "Your latest posts" on the Settings > Reading screen.
This way i have to create new page to use as home and its additional button, and when i click HOME button it opens that additional page i created. Is there way to make that extra page hidden or replace HOME button with name of that page?
I'm having trouble understanding you. Are you trying to blog on the front page, or a different page that you've created?
If you're trying to blog on the front page, add this to your theme's header.php and set both page settings back to "-Select-":
<?php if (is_home()) { ?>
<li class="current_page_item"><a href="<?php echo get_option('home'); ?>">Home</a></li>
<?php } else { ?>
<li><a href="<?php echo get_option('home'); ?>">Home</a></li>
<?php } ?>