Anyone steer me to set up video for yongnuo Yn622n tx trigger and Yn685 flash for Nikon? You tube vids haven't been helpful.

I'm going to point you to a YouTube video, but NOT for the video itself...

Beneath that video you'll see a fairly lengthy comment (once you expand it) by @rmassa8 who says that he wants to "offer some assistance with this YN685 flash and the YN622N-TX trigger system".  If it's not at the top of the page comments, try doing a page "find" search for "rmassa8" to find it.

https://www.youtube.com/watch?v=bKlhmc1Ivhg

Hopefully that might help.

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P.S.  I'm going from memory as it was about 10 years ago, but you may find some of the modes "troublesome", for lack of a better term.  There were lots of posts at the time about what combinations and what modes seemed to work and which ones didn't.   If you have trouble with Nikon's iTTL, you may want to try using the wireless remote MANUAL power mode settings.

I seem to recall that by the time they came out with the YN685TX Nikon trigger and the purely manual YN560 remote flashes (the later versions had the wireless receivers built in), that it was a pretty reliable "remote manual power" combination.  But it's so long ago that I'm not sure how reliable my memory is on the various Yongnuo model combinations and how well they worked.

Sorry that I couldn't have been more helpful...