Using temporary email is straightforward: generate an address, copy it into the website or service that asks for an email, then return to the temporary inbox to check for incoming messages. Keep the page open if the provider uses short-lived sessions. For important accounts, use a normal mailbox that you control permanently.
For practical use, always review the provider rules and avoid sharing sensitive information through temporary inboxes. A temporary address is best suited to low-risk, short-term interactions.