Hello,
I saw the screenshot you attached.
To change the tab 1 , tab 2 text you can edit the page and edit the section and you can change the text.
Screenshot for Clarification: https://ibb.co/4SGypqF
If you want to change the text itself then you need to install and use loco translate and can translate the string according to your needs.
Screenshot for Clarification: https://ibb.co/wsGNRT4
You can watch the video on how to translate using loco translate: https://www.youtube.com/watch?v=D3NsDdMzsls
Best Regards.