How to find position of an item in table?

Hey there.

Trying to scroll through table 'F' in my script

local E = A:WaitForChild('C'):WaitForChild('H')
local F = {"your","my","we","yeet",}

for x123,x124 in pairs(F) do
	if E.Text == x124 then
		E.Text = F[x123 + 1]
	end
end

I plan to put this in a repeat to run it over and over again, where it fades in and shows the next message, then fades out and shows the next one

I thought where I put ``E.Text = F[x123 + 1] it would make E.Text equal to F[2], since x123 is one at the moment.

Where am I wrong

EDIT:

I updated my code to this, but I get 'nil' - you also get some bonus content

repeat
for nn = 0,1,0.05 do
	E.TextTransparency = nn
	wait(.05)
end

local abcd = #F
	for a,b in pairs(F) do
		if E.Text == b then
			local function yeet1()
				if b == #F then
					return 1
				else
					return b + 1
				end
			end
			print(tostring(F[tonumber(yeet1)]))
		end
	end
for mm = 1,0,-0.05 do
	E.TextTransparency = mm
	wait(.05)
end
until 1 == 2

while wait() do
	for zz = 0,1,0.01 do 
		wait(.05)
		E.TextColor3 = Color3.fromHSV(i,1,1)
	end
end

To find the key of an arbitrary value in a table, we can use linear search:

local function LinearSearch(TargetTable, TargetValue)
	for Key, Value in pairs(TargetTable) do
		if Value == TargetValue then
			return Key
		end
	end
end

local TargetTable = {"a", "b", "c"}
print(LinearSearch(TargetTable, "b")) --> 2

With linear search, the number of possible steps we have to take through the table in the worst case (value is at the last element iterated over in the table) increases linearly with the growth of the number of elements in a table.