# Locking email There are some cases where you might want to lock the user's email, for instance when a user is signed in to an email account. In order to do this, when you call our iframe, just add a querystring to the iframe like so: ``` ?email=someone@gmail.com ``` This will pre-populate the email field. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.nftpay.xyz/integration-docs/locking-email.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.