Before you can upload to YouTube using your Google account you must create a channel on YouTube by following these steps:
1. Go to http://youtube.com and make sure you are logged in with correct account by clicking on the account icon in the upper right corner:
2. Next click on this link and fill out theform:
https://www.youtube.com/create_channel
3. Now you can add this account to use for uploads from Screencast-O-Matic
3. Now you can add this account to use for uploads from Screencast-O-Matic