- Visit https://usegalaxy.org.au/
- Register for an account (using the 'Login or Register' link in the page header)
- Upload some data files (use this icon on top left)
- Find a relevant tool be searching for its name or function (type into this box on the top left)
- Change relevant parameters for the tool and push the Execute button
- Your results will be generated.
For introductory tutorials that describe how to upload data and invoke a tool, see https://training.galaxyproject.org/training-material/topics/introduction/