The Subscription Confirmation can be disabled from the Dashboard > Forums > Settings > Features Tab. More info here: https://wpforo.com/docs/root/wpforo-settings/features/#double-opt-in

1) FORUM TITLE: Case Adverts

You can change the Forum title from Dashboard > Forums > Settings > General tab.

3) legal reps get a notification that a new topic has been posted in case ads forum 

The users should subscribe to the current forum/topic to get email notifications. wpForo has many subscription tools and options. e.g Subscription Manager, that can be found in My Profile > Subscriptions page

Doc for wpForo Subscription feature:

https://wpforo.com/docs/root/topics-posts/forum-topic-subsciption/

4) a legal rep replies that they want the case. Director who posted the topic gets an email notification of their reply.

In this case, the s/he should just subscribe to the current topic subscription checkbox

https://wpforo.com/wp-content/uploads/2016/08/wpForo-Topic-Subscription-Checkbox-1024x423.png

5) Director confirms and closes topic for further replies 

The director will just need to click on the closed icon. It'll not allow users to post new replies.

More info here:

https://wpforo.com/docs/root/admins-and-moderators/topic-post-moderation/

the difficult part is that for each and every case advert the user would have to subscribe and confirm email for a notification. I need a fix for this please. 

Just to spell it out:

1) FORUM TITLE: Case Adverts

2) A new topic is created to advertise a case 

3) legal reps get a notification that a new topic has been posted in case ads forum 

4) a legal rep replies that they want the case. Director who posted the topic gets an email notification of their reply.

5) Director confirms and closes topic for further replies 

can you please let me know what I need to do to use the plug in like this?