Sometimes we need to show drupal 7 blocks at certain page, say home, then go to: Administration » Structure. Click configure of the block you like to show content, and you will leaded to: Administration » Structure » Blocks.
At “Show block on specific pages”, choose “Only the listed pages”, and fill in “”. Done.
If you like to show the block at certain page, say “About Us”, 2 sides:
Side 1, if do not use pathauto module, and “About Us” page is node/5, just fill in node/5;
Side 2, if you have installed pathauto module, and “About Us” page url is about-us, then fill in: about-us.