Need help with steps 6-8

Step 6. Switch to Sophia's account. Change the default permissions to "-rw-r----"for Sophia when she creates a file or directory. Check the value of umask, and permission of a new file after this step. Step 7. Create a new file called "Sophia_homework" in the home directory and put your name in the file. After this step, remember to check the content and the permission of the new file. Step 8. Copy "Sophia_homework" to the /home/cyse_project directory. After this step, remember to check the permission of the file in the shared directory. a Activities Terminal Feb 26 13:39 lance@lance-VirtualBox: - lance@lance-VirtualBox:-$ sudo u Sophta -s Sophia@lance-VirtualBox:/home/lance$ sudo chmod -rw-r..... chmod: missing operand Try 'chmod --help' for more information. Sophia@lance-VirtualBox:/home/lance$ 1 A ? Left 46