From the store dashboard, click on 'Appearance'
1- LOGO
You can upload your logo from your files
2- Favicon
You can upload your Favicon by clicking on Upload Favicon
3- Colors
Then go to Colors to set the color to be set for labels, buttons, and variants
And Save changes
4- Fonts
Go to Fonts, set the header font family and its style
Set the body font and its style as well, then Save changes
Next step to continue customizing your store, go to: