See Title.
I specified needed parameters in the head of a script:
param ($G_ARCHIVE = $(throw "Need file to upload!"),
$G_LOGFILE = $(throw "Need logfile!"))
When I want to debug the script with Powershell ISE: how can I fill these parameters?
Use the command pane. Open the script file in the ISE editor, set the breakpoints (F9). Then in the command pane type a command invoking this script with required parameters. I do not think there is another (built-in) way of doing this in ISE.