On Facebook. how do I change my photo album "Wall Photos" to public?

I was just wondering how do I change it to public because I tried and it said "You can change the audience for each photo in this album"? But I am trying to do it on public how do I do it?

Thank you for helping me out no links please
Update: I just got the timeline so I don't know Facebook automatically switched me to it /x
Update 2: I know that it just says "You can change the audience for each photo in this album" it won't let me change it ah help me out be more specific at least
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