Why does my script not enable these GUI's?

Hi there, I've been having trouble with my script. (naturally)

What I'm trying to do is make it so my script will enable all the of GUI;

-alterme (regular ScreenGui) -Frames (Frame)

• face (picture)
• warning (picture)
• text1
• text2
• text3

but when I run the script, it goes through without error, but does absolutely nothing in the process.

Script:

getScripts = script.Parent.alterMe

local onJoin = getScripts:GetChildren()

for i = 1, #onJoin do
	visible = true
end

I've been at this all day and quite frankly this 7 line script has given me a real bad headache. Any help would be appreciated at this point. :)

getScripts = script.Parent.alterMe

local onJoin = getScripts:GetChildren()

for i = 1, #onJoin do visible = true end

getScripts = script.Parent.alterMe

local onJoin = getScripts:GetChildren()

for i,v in pairs(onJoin)do
	visible = true
end

local getScripts = script.Parent.alterMe

local onJoin = getScripts:GetChildren()

for index, value in pairs(onJoin) do

    value.visible = true

end

in pairs(tablename) iterates through the table 'tablename' at each index 'index' and returns the value at each index. In your case, the values would be everything inside the table 'onJoin'. However if you have an object inside of alterMe that doesn't have a 'Visible' property, an error will be thrown.