If you are having issues logging in with your PIN, You can click the "Trouble Logging In" button at the bottom of the PIN input screen. Just enter your phone number and click "Reset My PIN" at the bottom of the page.
You will be sent a new text message with a link that allows you to create a new PIN.
If you have further issues, please reach out to BlytzPay support at support@blytzpay.com.