Head to send > email > simple search and enter your email address in the narrow search by personal details field (*you’ll need to make sure you’re on the database first)
Click count results at the bottom of the page (this should show 1 contact) then click next.
*If you're not on the database head to contacts > create contact and add your details.
You can now build your email (or load up a saved email) and click next.
Make sure under 'who will receive this email' there is only 1 recipient of your email, tag content as test and tick the test send box (this will make sure your test send doesn’t get stuck behind any other broadcasts)