Bypass an email check for Bug Bounty

Hello everyone! Could someone tell me how I bypass an email check for Bug Bounty, please? So: I enter an email to create an account on a website, then the website says it sent an email confimation link to the email I typed, but then what do I do to bypass this?

You can try using temp mail to receive the confirmation link. If the code in the backend is there to send an email confirmation when you type an email, you cannot do much in this case unless you get access to their backend code.

What is backend code and how do I get access to it?

For that you have to think about ways to get access to the system itself to change the code but if you get access to the system then why bother changing the code as you already got access to the system.