You can add labels to your inbox messages to help keep your messages organized.
Log into your Gmail Account.
Select a message from your Inbox that you would like to place a label on.
Select the "tag" above the Inbox messages.
You can either select a tag that has already been made or just type in the new tag you would like to have.
If this is a new Tag select the Create New option under where you typed in the name.
The messages will automatically be separated into the folders associated with the tags you have assigned.
You can remove the tags from messages if you'd like, also.
Select the message you would like to remove the tag from.
Under the Subject Line, select the tag you would like to remove, and click the "x" next to the tag.