Where is the "Thanks" button (I'm not joking, it doesn't show up for me much at all)

You can see from my profile that I've been a member for a long time. I'm not very social, so I don't troll the threads much, just use what I need for the device in hand. I always appreciate what others have put out and I do like to show my appreciation, but I've noticed over a few years (there's gaps between my site use), that I for a large part, can't "Thank" the OPs. If there is a write up or tutorial link someone can point me to, then please do. I did try to search the entirety of XDA, but you might imagine searching for "Thanks" and the like will primarily pull up a lot of posts asking about Thanks..

I should say I DO know where the button "should" be, but it's just not there on a lot of the OPs I look at.

Thanks in advanced for you help.