You should open a forum to be able add a new topic. Just click on your single forum title and you'll see the [Add Topic] button. Topic can't be added outside of forums, it's always attached to some forum so you should go to a forum for new topic creation. I see the button:

Video: https://www.screencast.com/t/GGgL5CUbxutb

https://www.ourrevolutionsouthernoregon.org/forum/forum-purpose-and-protocols/