If you go to the gog.com page, and search for a game, you can find 'forum link' down there.
But where is this link, on the GOG Galaxy launcher?
I cannot find where to go directly to the forum for a game I have installed, via the galaxy launcher.

If this is not implemented, it really needs to be.
It's too inconvenient to have to go to the main webpage just to link to the forum for a game.

May be better to ask that question here:

https://www.gog.com/forum/general_beta_gog_galaxy_2.0#1626858394

This is general discussions so you have a mix of people who do or do not use the client, The link posted is about Galaxy specifically so you should get answers there.

It’s not implemented, it probably never will be. Thankfully galaxy is optional, so just remove it entirely, save yourself some disk space. Just download the offline installers.

1. Click the game in either the Installed or Owned Games section, so that you're looking at the details view.
2. Click the More button, to the right side of either the Play or Install button (it looks like two slider controls).
3. Click "View in Store".
4. That's the store details page, which you're no doubt already familiar with. You can click the "Forum discussion" link there.

Relevant community wishes:
Add Store Page and Forum links in game menu under "More" button.
Link to community forum from game in library
provide link to a games specific forum in games drop-down menu in library.

But we shouldn't have to go to the store, in order to read the forum on the game.. that's my whole point.

For some obscure reason they don't want Galaxy users to easily access the forum. Maybe because it's an ancient wreck full of bugs that sooner or later they will delete completely.

Yep, along with offline installers and the web pages.

Bookmark the Forum you want and a lnk will be creaed in your left Galaxy menu

I appreciate the work-around and how we can do it.
I just want it to be integrated.

If you link the "community" page you will have a fully functional way to use the forums in Galaxy. Exactly the same as the web and specially if you have your game subforums marked as favourite.

Unless they change the way how the forums work or create a different forum, to me, it is not exactly a workaround but a Galaxy feature,

A different thing is that probably in the future they could add a feature to be able to go to the specific game forum using the way you use to go to the specific game store, via the Galaxy menu.

Greetings