After you find an interesting trial you’ll have to apply and qualify. Just because you apply doesn’t guarantee you’ll be accepted. Here’s the typical process: Pre-screening: Usually online, apply to find out if you meet the basic high-level criteria. This might include age, medical history, and current health conditions and medications. In-person Screening: The next step will likely be an in-person (or video chat) screening that will be even more detailed. This is how the people running the study to decide if you’re a good fit. Agreement: Once you pass the screening and get accepted, you’ll have to sign an agreement regarding your participation and the payment terms. Don’t be discouraged if you don’t get accepted at first — sometimes it’s not meant to be. There will always be more clinical trials to consider.