Logo Settings.

First, click on 'Settings' on the left-side menu. Alternatively, in the Dashboard page, navigate to the 'App Setup' section and click on the 'Customize Setting' option. On the right side, you will see the 'Go to Settings' button. Click on it, and it will take you to the Under Construction settings page.

In the 'Text Customizations' section, you will see a radio button on the top right side for the 'logo'. Choose this option to upload your own logo. 

Note: Images are supported in PNG, JPG, and JPEG formats.

After choosing the 'Logo' option, you'll see the 'Upload visual' button. Click on the button and select your logo.

After that, click the 'Save' button, and your changes will be visible in your store.