The option menu "Insert Free POU" is not available in SoMachine/Machine Expert - Basic.
If you want to insert a Free POU between two others, you can follow these steps:

1. Add a new free POU
2. Select the new free POU
3. Use the keyboard Ctrl+X  (cut)
4. Select the Free POU where you want to insert the new free POU
5. Now use the keyboard Ctrl+V (paste)

Released for:Schneider Electric India