How would I go about changing a decal image on a part based on key input?

i want to change a decal image based on key input but sadly i'm facing issues. due to the input script being a LocalScript in StarterGui, it makes me unable to change the decal on a part. i don't have a work-around, and i need help.

So first you would have to detect the key input like this

local UserInputService = game:GetService("UserInputService")
 
local function onInputEnded(inputObject, gameProcessedEvent)
	-- First check if the 'gameProcessedEvent' is true
	-- This indicates that another script had already processed the input, so this one can be ignored
	if gameProcessedEvent then return end
	-- Next, check that the input was a keyboard event
	if inputObject.UserInputType == Enum.UserInputType.Keyboard then
		print("A key was released: " .. inputObject.KeyCode.Name)
		 if  inputObject.KeyCode.Name == your key string then


		end
	end
end
UserInputService.InputEnded:Connect(onInputEnded) --from dev wiki

docs can be found here https://developer.roblox.com/en-us/articles/introduction-to-input then just use that to change the Decal.Texturn to whatever link you want

local UserInputService = game:GetService("UserInputService")
 
local function onInputEnded(inputObject, gameProcessedEvent)
	-- First check if the 'gameProcessedEvent' is true
	-- This indicates that another script had already processed the input, so this one can be ignored
	if gameProcessedEvent then return end
	-- Next, check that the input was a keyboard event
	if inputObject.UserInputType == Enum.UserInputType.Keyboard then
		print("A key was released: " .. inputObject.KeyCode.Name)
		 if  inputObject.KeyCode.Name == your key string then

			Decal.Texture = "url"
		end
	end
end
UserInputService.InputEnded:Connect(onInputEnded) --from dev wiki

like that