Cannot find my power where my power steering goes

Question edited for clarity, add maker, add CAPS.

This is a well known issue with this electric power steering.

https://www.google.com/search?q=2013+Ford+Mustang+V6+power+steering+assist+fault+when+its+cold

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Where is this hydraulic fluid being used? Steering?

Do not use DOT 3 brake fluid in a power steering pump. It will eat away all of the seals and hoses. If you are looking at power steering fluid, any power steering fluid will work. If we are talking about brake fluid, Then yes use DOT 3 brake fluid or DOT 4 break fluid. The top of the master cylinder should tell you which to use.

Thankfully it wouldn't damage anything. However it is a messy job to drain the fluid back out. Either a shop can do it for you, or you can simply remove the return line and place it into a bucket. Turn it by hand to get most of the fluids out. Replace with cheap Type F, since you'll probably have to do it a few times to completely replace the fluid. Make sure its all red (Type F) or clear (Powersteering fluid). Good Luck

Yes most of the time you can get a seal to replace the one that is there. I am pretty sure the parts stores have one for your steering gear box.

flush the power steering with f type fluid 3 times and by the next day or two the noise will stop

Nothing will happen. Power steering fluid is what you should have used. ATF is Automatic Transmission Fluid.This fluid is more intended where friction qualities are needed.It will work, but power steering fluid is better for the pump and hoses and gives the rack and pinion a better lubrication the ATF.Don't worry you are fine as it is.

you can change it but the fluid is about the same i was told if your power steering was low and you had none you can sub trans fluid

Changing the fluid would not cause this issue your describing. try turning the steering wheel hard to the left or right to unlock the ignition.

must not be tight, your pan cause has no pressure?