The white is probably either teflon tape or teflon paste. Be sure clean out all of the old teflon and any other goup out of the threads. I may overdo the cleaning, but I used to work in high vacuum systems that can neaver be to clean. Clean seals don't leak.
The teflon paste is easier to use, but be careful not to add to much - I have never found adding more goop ( of any sort) to be helpful in stopping leaks.
I like teflon tape, just cut a strip long enough to go around twice. Be sure to go around the right way (CW with the threads pointing at your face - I think). If you get it wrong, the tape will unwind when you tighten it.
With either teflon, I would start by hand tightening. Then lightly tighten with a wrench. Overtighting doesn't help and may hurt if you cut the teflon to schreads. Really overtighting can damage (tapered) pipe threads.
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