How do I change the CPC on Google ads?

How to edit the default bid of one or more ad groups

  1. Sign in to your Google Ads account.
  2. Click Ad groups in the page menu.
  3. Check the checkbox next to any ad group with a default max. CPC that you’d like to edit.
  4. In the Edit drop-down menu that appears, click Change bids.
  5. Enter a new default max. …
  6. Click Apply.

For More Information Please Refer: https://support.google.com/google-ads/answer/2375408?hl=en