If you installed a fresh WordPress blog system on your website ,before writing new posts, you will need to remove the sample comments, blog posts, etc. This can be done in the following way:
1. Login to your WordPress admin dashboard.
2. Under Dashboard Menu, hover your mouse on
Posts and click on "
All Posts".
3. Hover your mouse on the "
Hello World" post and the "
Trash" option will appear. Click it to remove the post.
4. Now do the same with the sample page by pointing your mouse on "
Page" in the Dashboard menu and then choosing on "
All Pages".
5. Choose "
Comments" from the dashboard and then the "
Trash" option will appear. Now click it.

After you take these steps, your blog will be clean, without sample posts and comments, and you can start blogging.