To Decline a single survey simply select the Decline button in the invitation you have received.
If you wish to no longer receive any Survey Email Invitations from Web Survey Creator simply enter your email address and click Block.
In the future, if you wish to again participate, you will need to come back to Web Survey Creator and choose Block Emails from the web site footer menu in order to Unblock your email address.
If you wish to participate again you can enter your email address and click Unblock.