My users do have some issues with the add topic button. 

They are fine with the first add topic button to create a new topic. The issue occurs after they have completed the topic with title and text. The don't find the button Add topic logical:

They do think that will create a new topic. To them a more logical text would be like Save or Upload.

Is it possible to change the text? My guess is that both buttons are based on the same phrase to changing the phrase will not be a solution.

Thanks for advice.

Helge.