The DESKTOP-HDO534S is your computers hostname. You can change that in your computers settings (depends on your operating system) by changing the name of your computer.
However what I think you really want is to use a domain name e.g. myproject.com and have it publicly accessible by other people. If this is the case then you need a few things:
Buy the domain name from a domain name registrar
Host your code on a publicly accessible server
Point your domain name to the server
I would focus on #2 first, the other stuff is easier. For #2 the quickest starting method is to host your code on Heroku (hobby plan is free), there are instructions here https://dash.plot.ly/deployment