How do i get rid of the wordpress login logo top left of my screenshot ?

Please navigate to Dashboard > Forums > Settings > Features admin page, disable the "Show Admin Bar for Members" option. 

More info here: https://wpforo.com/docs/root/wpforo-settings/features/

Also how do i create private register / login page to the front that hides the forum page ?  

Also is there a way to make it private registeration where the administor has to check thier details to approve the request each time ?

Please note: user registration and account creation is a part of WordPress core. wpForo only provides a registration form.

If you already have a registration approval function in WP then it'll work for wpForo. If you don't have such function please search for Registration activation plugins, they should work for wpForo too. These are two good examples:

1. https://wordpress.org/plugins/new-user-approve/
2. https://wordpress.org/plugins/wp-approve-user/

Also how do i create private register / login page to the front that hides the forum page ?  Also is there a way to make it private registeration where the administor has to check thier details to approve the request each time ? 3351