New directory - permission denied

In file manager of debian i make a new folder, but i cannot make a new folder in the directory : /home/snookerboy/1/microscope/client/
maybe the localhost:3000 is running and microscope project is running , that s why i cannot make a new folder in client folder, even i cannot paste a folder to the client folder
Please help.I m new to server programming and I want to start with javascript and meteor.