Getting rednet to send input

Ok so im not the best at computercraft and I was just making a sort of login/ account system involving a master computer and a computer that will hold all the accounts/ password. So what im trying to do is if someone were to use the computer it would ask the user to make an account and i use

input = read()

to read the input the user types so say if they typed (john111) as a username i want rednet to read the input somehow and send what was typed, any help? Im sorry if I wasnt as informative

Just send input

rednet.send(ID, input) -- change ID to the master computers ID

Oh wow thanks for the quick response! It works great, thanks.