How to script a gui that changes a decal by putting a decal id

Help and Feedback Scripting Support
#1

This is my error, what I want to achieve is in the title lol. I’ve tried researching and nothing has come up while researching.

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Here is my block of code.
local textbox = script.Parent
local decal = game.Workspace.Part.Texture

decal.Texture = textbox

It is currently inside of the UI in a local script.

#2 
decal.Texture = textbox.Text
#3

Whenever I try changing it after loading into a game, it does not change. Here is the script.

local textbox = script.Parent
local decal = game.Workspace.Part.Texture

decal.Texture = textbox.Text

#5

Im not understanding what you mean?