Prepare a spreadsheet document. List your players' names in the first column, their e-mail addresses in the second column, and your desired password for the player in the third column.
Save the spreadsheet in .xls format.
Once you've prepared the spreadsheet, go to your Project Manager page and click on the 'TOOLS' button on the left side of the page.
Click on 'Users'.
Click on 'invite more players'.
Scroll down. Click 'choose file' to select the spreadsheet you prepared, and click 'upload'.
If your invitee already has an account, they will receive an e-mail notifying them that they've been invited to the game.
If your invitee does not have an account, the system will create an account for them, and they will receive an e-mail with a system-generated password to log in with, as well as a notification that they've been invited to the game.
Uncheck the option to "Send an email to all invited players" if you do not wish for your players to receive an email from Gametize.