Hello @alexrodrigues1,
Thank you for reaching out,
Is the content inside the red box inside the site, or did you write on the image? We do not edit music in the theme. You can find all the styles, including typography, padding, margin, color, background, border, etc., in the Customizer.
To access the Customizer, navigate to WP Dashboard > Appearance > Customizer.
You will find options in the Customizer> Typography to manage all typography, for example https://postimg.cc/svhCLK92
To edit the category description in the archive pages, you must adjust the body typography in Customizer> typography > body: https://postimg.cc/6yg52yz8.
To manage blogs and single posts, you can go to Customizer > Blog: https://postimg.cc/6TZHJPSF.
I hope it helps.
Best Regards