- Questions regarding Q&A Plug-in - 1) Template - Just

Hi – Questions regarding Q&A Plug-in -
1) Template - Just downloaded the Q&A plug-in, however it’s not going great with my existing theme.. Can you please suggest the theme which is used in the DEMO video (Answer Factory) and few good themes? https://premium.wpmudev.org/project/qa-wordpress-questions-and-answers-plugin/ ? How can I download it? (I am looking at Cross browser compatible & Mobile friendly)

2) SEO – How can I modify SEO elements for Q&A homepage, categories & tags etc? Is Yoast SEO plugin compatible with this? Else please suggest some plug-in?

3) Height of the textarea - How do I reduce the height of the textarea box across the site (The Question body composer visual editor) ?

4) Not giving 404 Error – I tested the plug-in in a different location for testing purpose and deleted it completely… However instead of 404 error, its displaying the homepage..
Here is the url - http://www.beautyglimpse.com/questions/ask/ - It should return a 404 error. How do I fix it ?