twitter help (about DM)?

[Emily]

selena gomez just followed me, i tryed to DM her but i dnt see her name on the send___a direct messege thinggyy

why dnt i see her name if shes following me? btw i have the old twitter, i havent updated it

[Mrunal Patel]

lets say if her username is selena_gomez then you directly type following message in your status

"@selena_gomez blah..blah..whatever you wanna say in 120 words"

then it'll send her the message