Trouble making changes to desktop

[megannicole]

I am a fairly recent Macbook Pro owner and I have recently had problems making changes to my desktop. I cannot drag and drop photos anymore, save files to the desktop or move files to the trash. When I try to move files from the desktop to the trashcan a popup comes up that says "Type your password to allow Finder to make changes." when I put my password in nothing happens. I know I must have changed something in my settings but I cannot figure it out. Any help will be appreciated. Thank You!

 

[iDid]

Seems your finder is locked.
Right click on the finder >>> informations >>> Uncheck "locked"