Here are the steps, please follow this guide:
- Please login first to your Wordpress dashboard after that you click the Appearance menu and then click the Widget menu.

- From here, you will be able to see your current Widgets in your WordPress theme.

- Navigate to an existing widget by clicking the down arrow button, which allows you to customize the Widget.
- You can add a new widget by clicking the inserter [+] button from the top left side. Then scroll down to the Widgets category.

- Once you are done customizing or adding new Widgets, make sure to click Update.
