If you need to update one of your existing Goals, within the Goals section of Matomo, click to view the Manage Goals section. You should see a table of all goals configured on your website along with a summary of their configuration. You will need Write permission to view the page.
To edit any of your goals, simply click on the square pencil icon in the Edit Column and you’ll be presented with a similar screen to the one used to create goals. Make any required edits by following the Goal Creation steps shown above, and then hit the big green Update Goal button to confirm your changes.