Do you need to add more keywords to an ad group that you've already created? Or maybe you're looking to test some new keywords that you haven't tried before?
You can add new keywords to current ad groups by going to your Pay Per Click Dashboard (PPC Dashboard). You can get there from the Jump To menu in the top left corner and selecting, "Ad Campaigns."
You can add keywords by clicking on the "Keywords" tab and then by clicking on "+ Add Keywords". From here, you need to select the Ad Group you want the keywords to be linked to, and then you can start searching for your keywords.