Use the new topic to start a new discussion topic whereas use the add reply if you want to add to the topic that has already been posted.
New Topic
Please use the "New Topic" button to start a new thread. Take time deciding on a good title for the topic. "Hi" " "What do you think?" and other non-descriptive titles should be avoided.
Add Reply
Use the add reply to reply to a topic. Use the add reply only if you are going to contribute to the topic. Please do NOT hijack a thread by changing the subject. If you want to change the topic then use the NEW TOPIC button. | 
Linear Mode
