To remove the plugin.
                                                
                                                    - Remove the page from admin / pages
- Delete plugin file from qa-plugin folder
- Database record you need to delete manually . I may help you in that.
BTW, is there any reason you want to delete the plugin?
                                                For the YouTube error, I am working and it is almost there to fix. It happened due to new YouTube API.
                                                You can directly talk to me on skype ID q2amarket