unlock files

Microsoft Office Word Docmanagement

otiki
how do i unlock my word document files, I did something 
to lock them (I don't know what) and now I can't type 
into them, the message at the bottom says "this 
modification is not allowed, because the document is 
locked"

The toolbars are dimmed and I can't activate the unlock 
button
                                            
Suzanne
Have you activated Word?