[Solved] Lost password not working
Also disable all in one seo because it seems not to work. Install SEO FRAMEWORK plugin if you need seo.
And leave wpForo SEO enabled (now seems disabled).
Ok one by one the problems.
You have no login/register anywhere !!!
After finding them (tried to Add a topic), they are different and wrong.
An other error you have everywhere is a JS error from Nivo Slider something. Find that plugin and disabled it. If you have no such plugin installed, then some other theme or plugin use it.
It creates an error. Not related to wpForo. It is all over your site.
Press F12 in Chrome to see it.
An other problem (actually two problems in one).
You have some errors in your debug.log
BUT NOBODY SHOULD BE ABLE TO VIEW THAT FILE. Only YOU via a plugin or ftp or Cpanel. This is a proof that your hosting is not good at all. That file should return a 403.
Now there are two warnings that probably come from some plugin you have installed. This can only be debuged if you disable all the plugins and trial and fail. And only if your site has some usage, otherwise it may not be evident easily.
Finally disable the All in One SEO.
If you need SEO, install SEO Framework and enable wpForo SEO.
All in all most problems are related to Wordpress installation and hosting. Maybe hire an experienced webmaster to help you out in the initial setup and tune.