How do you add a broad match modifier?

How to add a modifier to an existing broad match keyword

  1. Sign in to your Google Ads account.
  2. From the page menu on the left, click Keywords.
  3. Hover over the keyword you wish to edit, then click the pencil icon .
  4. Add the plus sign (+) prefix to any word you want to make into broad match modifiers.
  5. Click Save.

For More Information Please Refer: https://support.google.com/google-ads/answer/7042511?hl=en