Apologies, I realised this would help after posting 🙂
I’ve set up a temporary WP site on a personal server with the same theme, WP 4.7.5 and BBPress 2.5.13 at http://wp.createlabs.co.uk/forums/
At the moment, the links to Child Forum 1 and Child Forum 2 are just plain blue links with a comma after Child Forum 1 which separates them.
What I’d like to achieve is what I have put in the image link above? The bottom image is what I’m trying to get the links to look like (https://imgur.com/OKO9pZ8)
Instead of a plain blue link, alter the CSS to highlight each link so they look more like flat rounded buttons rather than standard links.
I hope that helps, please let me know if I can do anything else 🙂
Not tested this yet (I know this is nearly 3 years old – looking for something I’m currently working on) but I noticed that the code doesn’t have an opening PHP tag, just a closing one.
I added the opening tag, installed as shown above, and not had this above error.
Again, not tested but will confirm either way once I have set up a test post 🙂