I don't think I know what you mean by "tag".

ETA. Nearby maddielee says ''ask a youngun'. I know this is often the best way. OP probably never knew that a "tag" was vital HTML terminology, and, .... nm ...

You don't 'tag'. You comment on their post.

albert, ask a youngun they can explain 'tag' to you.

A tag is what is used on Facebook to identify a person in a picture. Often it's a group of people and when you click on the individual picture the name of the person (or what they are known by will pop up next to their picture if they were tagged.

As Maddie says, we don't tag here. We like a comment. Or you can flag a comment if it is offensive. Those will go to the moderators.

Tagging is used almost exclusively by social media, not by online discussion groups/forums. If you want to direct a comment to a specific individual, just preface that comment with their screen name.

Actually, many forums in which I participate have added tagging as a feature. It's nice when you want to reply to someone who isn't the original poster, or direct different sections of your reply to multiple responders. Obviously you can just type in their screen name, but the tag adds a hyperlink which IMO makes the call-out more obvious and makes the thread easier to follow. I have seen many threads with tagged user names here, so I know it can be done, but if it doesn't send a notification to that user perhaps it is not worth doing on this particular forum, as Debby_ab mentioned.

There's no way to get a person back to a thread unless they are getting notifications for new comments. If they have it set up to be notified when someone "likes" their comment, they may take a look back to see what the comment is. Most people don't have a clue how they have their profile set up though. Many people think they're set up to receive messages and they're not.

There is no hyperlink tag feature here on Houzz and no way to alert a specific poster other than to message them directly (if they have that feature enabled). I receive notifications with responses to my comments and with my name tagged (or highlighted, etc.) but that does NOT alert me to that comment! Only the notification does. So it does not "tag" that person like it does on social media.

FWIW, I have been a GardenWeb member for more than 20 years (as well as other forums - none of which I have participated in offer 'tagging') so have been with Houzz since the start of that acquisition and therefore am pretty familiar with how to work the profiles :-) The feature you are looking for just does not exist on this platform.

It’s why sometimes we see call outs in thread titles.