Hello! I'm Rixster...
Do you mean you put Transmission fluid in the Power Steering Res.?
As long as there wasn't a whole lot It shouldn't hurt it!
How on earth did you manage that?
You'll be fine! It won't hurt anything.
Just refill the trans. to its proper level and double check it.
I've done that too (glad it's not just me) hehe!
If you decide you still need to change the fluid don't forget to use the ATF+4 fluid in your Neon.