Pop [%RemovePrevious()%] in the footer of your question where you want to remove the previous button/arrow.
If you go to Survey Settings, under the General Format tab go to Navigation Buttons and click on Text. Under the Settings type in "Submit" for the submit button/forward arrow. This will be for all survey pages.
To create your own submit button for any given page, use the following HTML code ...
You will have to fiddle with the positioning.