Hi there,
The debugger is rather simple and not very sophisticated. The easiest way to use is to give the command: fgldb program.4gi (so just replace fglgo by fgldb).
You can use commands like continue (cont), display <var> step ect.
I don't really know what you are lokking for (posting slow??). If you have any more questions, just let me know.
Greetz,
Rob Prop