To Start a Discussion there are two options:
Option 1: From the homepage of any group Click the +NEW button in the upper right of the group banner and select Add Discussion/Ask a Question option.

Option 2: Click Forums in the Group banner, Click the Forum you wish to create a discussion, click the +NEW button in the upper right of the group banner, the Discussion form will display
Once you are on the new discussion page, complete the following:
- Type in your Subject
 - Type in your Body Content (format text as desired)
 - Add relevant tags
 - Choose your notification preference
 - Click Post
 
Also, be sure to review Tips for Posting Questions or Best Practices when asking a question or starting a discussion.