How to edit launch menu

To edit any of items, do the following:

Open launch menu, i.e. move mouse pointer to top-left of the screen. Alternatively, you can choose Options... command from pop-up menu of Sigma Launcher's tray icon, select Menu page, and go to step 3.
Choose Edit menu... command from launch menu. Options dialog will be opened on Menu page.
Select appropriate menu item from Launch List (may have scrollbar) by clicking on item in the list.
Change the item title: edit text in Title field below the Launch List.
Edit the item: click Edit... button below the Launch List, and set another program, file, or folder in the Edit menu item dialog.
Move item up or down: click Up or Down button below the Launch List.
After you finish editing the menu, to save the changes made click Apply button. Else, to discard the changes click Cancel button.

Additionally, you can enable or disable right part of launch menu that contains 'system commands'.