Once you find the experiment you want to participate in, you can click the blue button where it says “Join waitlist”.
At this point, for most experiments, such as Google Search, NotebookLM, and MusicLM, it will redirect you to sign in to your Google account.
You can then log in using your personal Google account, or create one if you don’t have one. It is important to note that you should not use your work Gmail account as it won’t be eligible to participate.
In some other experiments, such as Messages, there are specific instructions that you need to follow to be an early user. In those cases, just follow the necessary steps to get you signed up.