If you haven't already done so, you can signup for a MailUp free trial here. No credit card is required and the process is fully automated: you can be up and running with your free trial in just a few minutes. You will receive an e-mail message from our system asking you to activate the free trial: look for that message: it should arrive within moments of you submitting the free trial request (check the spam folder in case an overzealous spam filter got in the way). Please note that the free trial has a 25-recipient limitation.
Once your free trial has been activated, here are a few, quick articles to get you started.