By publishing your project, you will gain access to this feature. The 'Publish' button will change for a 'Visit page' button once it has been published. To access the menu, click on the arrow down.
You can change the name of your subdomain here.
Please note that you should only use letters, numbers, and hyphens (-) when entering your desired subdomain name.
For example, let's say by default my project-hosted URL is:
You can modify it into: