taylor swift rare songs trade? im new to the whole thing?

how do you trade taylor swift rare songs? because im looking for
'didnt they' and 'dark blue tennessee' and a few others
i have:

-All night diner
-better off
-closest to a cowboy
-drive all night
-fearless (demo)
-i heart question mark (demo)
-i know what i want
-look at you like that
-my cure (studio)
-never mind
-oh my my my
-songs about you
-stupid boy
-sweet tea and god graces
-ten dollars and a six pack
-the diary of me
-thinking about you
-this is really happening
-tim mcgraw (demo)
-we were happy
-what do you say
-your face
-silent night
-santa baby
-christmases when you were mine
-christmas must be something more
-white christmas