Hello,
Sorry for the inconvenience.
I checked your Screenshot. Previously, the homepage was displaying the default WordPress blog page, which usually happens when the homepage is not assigned correctly or the default theme is active.
Now I can see that the homepage is loading, but it appears to be broken.
Please make sure that the required page builder (Elementor or WPBakery, depending on the demo you imported) is installed and activated.
If the issue still remains after that, please share your WP Admin login details in the Private Content field so we can investigate it further.
Regarding your first question, These texts are the slide titles.
Please navigate to Slides > Edit the slide, then update the Slide Title field with your desired text.
https://postimg.cc/dDf5hLkc
Save the changes and check the slider on the frontend.
Best Regards
.
