How do you use a broad match modifier?

From the page menu on the left, click the Keywords tab. Click the plus button . Select an ad group to add broad match modifiers to. Enter your broad match keyword, with a plus sign (+) preceding the word or words you want to appear in your potential customer’s search exactly or as a close variant.

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