Code a "Forum" page for a Weebly website

I run and operate a membership based, online men's health community, www.agestrongcollective.com. I used the platform Weebly to create my membership website and didn't realize I'd have to purchase a third party application to setup a forum section. We are looking for someone to build a forum code for us to input onto our Weebly website. The forum should be able to have different topics (managed by me and my business partner) and for members to be able to leave comments underneath. We have three topics in mind that we would like set-up: 1. Ideas for Future Content & VLOGs 2. Mental Health 3. General Comments & Questions Thanks in advance!