Hello - I am not sure what you mean by "(don't find a "lock" under toolbar."
As for offsetting a grid line - you have to start the grid line command and use the offset in the options bar (below the ribbon). You cannot use the offset tool on the modify tab.
LD
If this helped solve your issue - remember to 'accept as solution' to help other find answers! You can't think AutoCAD and run Revit. Email: lisa@kalblue.com
