Web-based remote access using a browser is a feature of all the enterprise 'server' products: Enterprise Desktop, Cloud Server and the whole Terminal Server for Linux family.

Connecting through the browser to a machine which has the free edition installed is not possible because the free edition does not ship the web client. To reach a NoMachine server where the free edition is running, you can connect using any desktop or mobile player.

Check out the comparison of the free NoMachine edition and NoMachine Enterprise Desktop products. To get started with web-based remote access, take a look at the tutorial in the Support section of the website: 
https://www.nomachine.com/support/documents/getting-started-with-web-access.