You're trying to add a string value. Adding only works with int/number values. You can set the text of the string by simply doing,
2 | script.Parent.Parent.Parent.Parent.thingy.Text = "bleh bleh bleh " |
3 | script.Parent.Parent.Visible = false |
5 | script.Parent.MouseButton 1 Click:connect(onClicked) |
If however you wanted to keep the text that's already there and just add new text to the end you would do,
2 | script.Parent.Parent.Parent.Parent.thingy.Text = script.Parent.Parent.Parent.Parent.thingy.Text.. "bleh bleh bleh " |
3 | script.Parent.Parent.Visible = false |
5 | script.Parent.MouseButton 1 Click:connect(onClicked) |
If you wanted to add the string to the beginning of the text and keep the rest you would do this,
2 | script.Parent.Parent.Parent.Parent.thingy.Text = "Thanks Wfvj014" ..script.Parent.Parent.Parent.Parent.thingy.Text |
3 | script.Parent.Parent.Visible = false |
5 | script.Parent.MouseButton 1 Click:connect(onClicked) |
Hope that helped (:
Good luck!