Macro commands can be edited in by double-clicking (or Enter key) on the given command or by clicking on the toolbar button.
All the command parameters are listed in the upper-left area of the window. The selected parameter can be edited (modified) in the upper-right area. Notice the little buttons "..." and "V". The "..." button is available just for certain type of parameters (such as files, folders, macro names, etc.) and it opens a browse window. The "V" button open a window with variables and system variables and it allows to insert variable as a parameter. It is possible to navigate from one parameter to other parameter using "Ctrl+Up" or "Ctrl+Down" keys.
Help is displayed for each parameter in the bottom area of the window.