To change your servers difficulty, log into LYHMEPanel, select and stop your Unturned Server, then follow these steps:

1. Click on "Configuration Files

2. Click on [Text Editor] Across from Commands.dat  

3. the new row, add the following

password newpassword

4.
 Remove "newpassword" This can be whatever you wish it to be.

5. Once you are happy, click SAVE

6. Start your server