How would I fix this script for typewriter effect?

First of all you didn’t identify what text you’re changing. Assuming your script is in the textlabel, to reach the label we would do

local label = script.Parent

Then we would have to change the text

label.Text = "G/"

We then would continue this effect. Full script:

local label = script.Parent
label.Text = "G/"
wait(0.05)
label.Text = "Ga/"
wait(0.05)
label.Text = "Gam/"
wait(0.05)
label.Text = "Gam"
wait(0.2)
label.Text = "Gam/"
wait(0.05)
label.Text = "Game/"
wait(0.05)
label.Text = "Games/"
wait(0.05)

If you want a way to do this using less code, then just do this:

local TextLabel = script.Parent

local message = "Games/"

for letter = 1,#message do wait(.1)
   TextLabel.Text = TypeWriteString:sub(1,letter) -- This makes it so it waits 0.1 seconds and adds a letter until the whole message is there
end