Sakai has many different tools available to use in your course or project site. You may choose which tools you want to use and may add or remove tools at any point.
Go to Site Info.
Select the Site Info tool from the Tool Menu of your site.
Select the VoiceThread tool.
Once you have made all of your tool selections, scroll down and select Continue.
Confirm tool selection.
New tools added are shown in red font. Confirm that these are tools you want to add and select Finish. New tools are typically added to the bottom of the Tool Menu once you save your changes. See the How do I reorder tools? tutorial for instructions on how to change the tool order.