To customize the appearance of the theme to make it look better and according to what you want, you can follow the tutorial below, namely how to customize WordPress templates, here for the tutorial.
1. Login to your WordPress Dashboard first
2. Next you select Appearance " Customize
3. Then you will find a Customize page where on this page you can change the features provided by the theme, and of course each theme has different features.
4. Later you can change the Site Title and Tagline, you can simply select the Site Title & Tagline option, then fill or edit according to what you want.
5. Likewise with other features that you can adjust such as Fonts, Colors, Logos, and many others in this Customize mode, when finished don't forget to Save & Publish to see the results.