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Go to https://www.guerrillamail.com/ in your computer's web browser to do so. It's at the top of the Guerrilla Mail page. Doing so brings up a new email form. In the "To" text box at the top of the form, type in the email address to which you want to send your anonymous email. Type the subject of your email into the "Subject" text field. Emails with non-spammy subject lines are less likely to get marked as spam than are emails with no subject lines. Type your email's content into the main email text field and format it as you please. You can also add an attachment (e.g., a video) of up to 150 MB by clicking Choose file in the upper-right side of the form and then selecting a file from your computer. It's just below the COMPOSE tab in the upper-left side of the form. Doing so will confirm your request and send the email to your specified recipient under a random name and address. You can remain on the Guerrilla Mail website to view any responses to your email, but the second you leave the site, you won't be able to see responses.
Open GuerrillaMail. Click the COMPOSE tab. Enter the recipient's email address. Enter a subject. Create your email. Click Send. Check the "I'm not a robot" box.