1. On your dashboard click Add New. 

2. Enter a Filename, Select Language, Select a Voice, Select a Storage type, Enter script Text and click Create.

3. You will see a confirmation message in ScriptVocalizer saying "Project has been created successfully and an Audio "Demo_en-US_Joanna.mp3" has been created on Dropbox" where Demo stands for Filename, en_US stands for language you selected and Joanna is the voiceover name you picked. Also it's created into your Dropbox storage. 

Now, click the play button and listen to the file created. If you need you can edit the Text to make it more appropriate. Click Update to finish creation.

4. Click Back to go back to your dashboard.

5. You'd find your file on your dashboard.