Hi @flaviaNE5X6 ,

You can create a folder anywhere inside your Home folder and put LSP files there.

To be able to load AutoLISP files without security warning, you can add this folder to "Trusted locations" on Application tab of the Application Preferences window (menu AutoCAD -> Settings):

 You can also add this folder to "Support Files Search Path" - on the same tab of AutoCAD Application Preferences window.