Hey, Alejandra Finol ! Thank you for submitting to our Ucraft Support!
Please head over to Dashboard > Site Settings app and set the correct site name. In most of cases that's your brand name.
Then go to the Dashboard > SEO app. Find the page you want to change the title for, open the settings, and write the page title.
If you still have questions or need help with anything, don't hesitate to contact our Support Team via Live Chat!