no application running to view it...
Click once on the offending jpeg. This will select it.
Under the "File" command line item, select "Get Info" (you can also press command I).
At the bottom of the "General" section, deselect "Locked".
Close that Info window, trash the jpeg.
this will be easy for you guys, but I'm a beginner
Am using a Mac, OSX (10.4.10), and can't remove a locked jpeg that I have transferred onto my desktop from a data plug. Every time I drag the icon into the trash, the message tells me it cannot complete the action as the file is locked. Naturally I don't know any passwords.
Have I really got to keep this file for ever?