how to change a hint with a text box?

okey boys, so i want to change a hint with a text box, i made a script

asd = script.Parent.Text

game.Workspace.Message.Text = asd

but it didnt work so i made another that repeats

asd = script.Parent.Text

repeat
game.Workspace.Message.Text = asd
until dogs == 1

but it didnt work too, so after that i realized that the player cant change the text from the text box, and now im confused, help me