You would use it the same way as you would for any other language. Format your comments correctly and then run the dba source file through robodoc.exe to get the documentation.
The manual on how to do this is
here.
So if you had a dba file called test.dba and you wanted to get the html documentation out of it, you would put the file in the same directory as you installed robodoc.exe to. You would then navigate there using the command line and use a command such as:
robodoc --src test.dba --doc output.html --singlefile --html
Hope that helps.
