I have just created a new site using the composer command:
composer create-project silverstripe/installer /path/to/site
and then added the forums module via:
composer require silverstripe/forum dev-master
I'm logged into the site as the Admin user. I have done nothing else to site apart from a /dev/build. When I go to the forums menu item, the base forum (General Discussion) is displayed and a line of text tells me I can add topics. However, I cannot. There is no content displayed and no forum controls of any type at all.
A clue would be helpful here.