How I can manually tag a user?

Yes, you can. Adding tags will help you to send the broadcast messages and even on sorting users. You can add a tag to multiple users with entering the tag details individually.

It can be also done through the following steps,

Step 1: On the Users section select the single/multiple users by clicking on the checkbox.

Step 2 : Click on “Actions” button.

Step 3: Select “Add Tag” on the drop-down menu to add the required tag to the single/multiple users.

Step 4: Select “Remove Tag” on the drop-down menu to remove the required tag to the single/multiple users.