- Go to Commands > Manage post types
- Find the post type you would like to exclude from search and click the "edit" button to the right
- Click on Post display settings and scroll to the bottom of that section > Post behavior
- You'll see a check box labeled Exclude from search - check this box and save
Note that this only excludes posts of this type from the site search, and not from search engines like Google, Bing, etc.