In the Ad Groups view, click the Keywords button on the group's row. The modal lists all keywords with match type, status, Quality Score (QS), clicks, impressions, cost, CTR, CPC and conversions. To add a keyword, enter it in the Keyword field, choose the match type (Broad, Phrase or Exact) and click Add. For each keyword you can Pause, Activate or Remove it using the row's action buttons. Changes are applied to Google Ads immediately. This feature is for Search campaigns; Performance Max campaigns don't use traditional keywords.