From Online Manual
With Quick Moderation you can apply moderation actions such as sticking, deleting, locking and moving multiple topics at once. You can perform quick moderation on individual posts and topics. This is by having a checkbox next to each topic and post, and when you check the posts or topics you want to do a moderation action to, you click on a button at the bottom to do so. Quick Moderation must be enabled first in a user's profile.
For more information, see Look and Layout