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A lil hard to explain, But I'll try to explain!

Okay, So lets say that you'd make a folder in workspace
and put a TextBox in it
And the value "Text" inside TextBox would be "Hello"
So, And you would create a script inside TextBox with the script

"
Message = script.Parent.Text

print(Message)
"
That would return the text inside TextBox!
So, Now I'll tell you how you'd make a gui with such
So lets say that you put the textbox inside of a ScreenGui inside of StarterGui!
So, it'd be the same, the script inside of the TextBox
But the script would be
"
te = script.Parent.Text
script.Parent.FocusLost:connect(function(ep)
if ep then
loadstring(te)()
end
end)
"
So, That script will call a function called "FocusLost" when you click something else
and lose focus of the textbox, So. If you lose focus because of pressing "Enter"
then it will call a function called "EnterPressed" which i called "ep" in function
So, when that happens it will continue to the script i wanted it to run
which is "loadstring(ep)()" That will call the script! which will pretty much make the script run!!

BY THE WAY!! YOU NEED LOADSTRINGS ENABLED INSIDE OF SERVERSCRIPTSERVICE!!!