There are two ways for players to see what tags have been added:
OPTION 1 The only way they'll show up on the community's layout is doing this:
In the main community make a tagging post. This is a post that you tag with everything and where players can comment to request a new tag to be added. That way, they can copy and paste the established tags into the new entry here:
OPTION 2 If you want them to be able to find the tags that have been made (even if they don't show up in the layout), do this:
1) On the sidebar under "Journal" there's a link that says "manage tags". (Or click here for it).
This brings up a place where you (the mod) can add new tags. Do so where it says "Add new tags here!"
2) Then, players will make a post. They have to make the post first and then tag it. They'd click either 'Edit Tags' (if available on the layout)
or this button .
Then, they'd click the tag they want. If they need more than one, they hold down "control" on their keyboard while clicking different tags.
Unfortunately, there's really no other way I know to do it. Hope that helps!