Why does my script not change my TextLabel?

Instead of repeating the same line of code you could use some useful Roblox functions to make it much easier. string.rep concatenates 'x' times of a string together which then returns that string.

If I wanted to concatenate 'Hello' 3 times together, I could do:

local text = string.rep("Hello", 3)
print(text)

--Output:
--HelloHelloHello

We can use this in the while-loop to form the animated ellipsis effect:

local count = 0 --start at 0
local text

while true do
    text = "Loading"..string.rep(".", count)

    print(text)--for testing

    count = (count + 1) % 4
    wait(1)
end

On line 6, we use to calculate the count we're on by getting the remainder of count divided by 4 (Search the modulus operator for more).

So if we were on count 3. We add 1 to get 4 and divide by 4 which leaves no remainder making count 0 again.

The reason your Text may not be changing could be found by adding a few prints() to debug what does run. Like inside the if-statement on line 5 or checking to see your variable paths are right.

Remember that the while-loop is infinite so you will need something to break it.

The finished script should look something like:

local loadLabel= script.Parent

local count = 0
while true do
    loadLabel.Text = string.rep(".", count)

    count = (count + 1) % 4
    wait(1) --eh
end