The PayPal button is an exclusive feature for Premium and Platinum members.
Once you're signed in, click on 'More Tools' and select 'Paypal Button'.
If your Paypal account is registered with the same e-mail address as your Voice123 account, select the default e-mail address option.
If your Paypal account is registered with a different e-mail address, select the other option and enter the e-mail address in the text box.
Don't forget to click on 'Save Changes' when you have finished.
If you don't have a PayPal account, you can register for one at www.paypal.com.