How do i tell people I have an eating disorder?

I told my mom by faking that I was sick and going to the dr. and having my dr tell my mom. which my dr already suspected but because I just turned 18 she could not tell. and I told my best friend while she was driving home in the car with me. I sort of said im going to arizona for a few months. at a ranch called remuda ranch. its an eating disorder program. by the way remuda ranch is deff the best treatment center for eating disorders I would suggest there to anyone. im actually going back there and this time accepting the help. I have been to so many treatment centers. other ways u can tell her. is write it down. or leave a printout about a treatment center or what is an eating disorder on her desk or somewhere she can find it. or u can tell her in the car this way she still has to concentrate on driving.as with your friend come out and just say it. shes your friend she will understand. just say I have an eating disorder and I want you to help me by supporting me in my recovery. GoodLuck.