How to make - if imagelabel.Image = rbx... then print("Hello") ?

I know you keep asking similar questions, this is once again really easy, try doing your own research to actually learn.

anyways:

local RunService = game:GetService("RunService").RenderStepped -- render step on client.
local ImageLabel = script.Parent -- gets the parent ( assuming its the image button or label. )

RunService:Connect(function()
  game:GetService("RunService").Heartbeat:Wait()
      if ImageLabel.Image == ("rbxassetid://ASSET") then
         print("Image: " .. ImageLabel.Image:gsub("rbxassetid://", ""))
      end
end)

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RunService