You can add a keyword from your Dash Board.
1. Click Add Keywords.
2. Type it into the search field on the Keyword Search page and check if it is available. If so, you can add it to your campaign. If you exceed your number of free keywords, a pop-up will ask you to buy the keyword in addition to your existing free keywords.
3. To buy a Keyword, it will take you to a transaction page.
4. After you add or buy the Keyword, it will appear in your Keyword List ready to be used.