New to the forums

I've been searching and I need some help (couldn't find a solution).
I'm looking for a way to do a hot key or combination of keys to tag into IPTC.
I'm studying colors in photographs and want to tag them by what color harmony they use but can't find an easy and fast way to preview the image and apply the tag and move on.
Is there an easy solution in XnView?
Thanks so much!
Be safe!
Have a great weekend!
Cheers,
Kevin