Open your web browser (Chrome, Edge, or Safari).
In the address bar, type your website link with /wp-admin at the end.
www.mywebsite.com/wp-adminPress Enter.
On the login page, type your username and password.
Click Log In.
Now you are in the WordPress Dashboard.
At the top of the page, click the Add New button.
You now have two options:
Option 1: Install a Free Theme from WordPress.org
Option 2: Upload a Premium or Custom Theme
.zip file..zip file from your computer.After activation, go to Appearance → Customize.
This will open the WordPress Customizer.
Each theme has different customization options, so explore the menus.