In resource settings, set the option 
Email address verification to 
Never required. This will remove the email verification process.
Please note that you can alternatively make the email address field NOT required to be filled out by clients. To do this go to 
resource settings / reservation form and mark the email field as not required. This will also get rid of the email verification step.
Please note that without verification there is a danger of a typing error which will prevent you from communicating with the client. To minimize the change of typing error, you can add a required field named 
repeat email to the reservation form. This will force your clients to re-enter the email address. Please see 
Q202 for details.