Hello, @alexandredafonseca,
To solve your issue, please navigate to the Dashboard >> Porto >> Theme Options >> footer >> Scroll down a little bit you will see the copyright section. Simply set the content in it as per your need. Then check back to your site by clearing the browser cache. I hope you will get the desired results. I have attached a screenshot of the option to understand better: https://postimg.cc/ZBcPjBXq
Best Regards,
PThemes Team.