Start by going to Gmail on the Web at mail.google.com.
Next, select a message by selecting the check-box next to the message subject. You can select more than one message, but make sure they all match the same filtering criteria. This is useful if you want to select messages from more than one sender and group them all as coworkers or friends.
Go to the pull-down menu at the top of your inbox labeled More actions.
Select Filter messages like these.