Need SEO by Yoast Plugin to work with Simple Press Forum. Plus 'add topic' button not working

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Job Description

1). I need to have SEO by Yoast disabled for Simple Press Forum pages, so that the meta titles on pages such as have the forum topic title in them.
I have the same problem as this:

However, when I try and rewrite the title function in the header.php and functions.php file, the issue isn't resolved

(I have tried this:

2. The 'Add topic' button on my forum posts is returning 'javascript void' E.g. on
I need this issue resolved

Many thanks