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Typically, you'd need to contact an Authorized Lab Hoster (ALH). If you are attending an instructor-led class, the training provider or instructor will provide you with a dedicated login link, username, and password.
If you are using an online lab platform such as Skillable, GoDeploy, or Spektra, launch the lab interface through your training portal. Look for a tab on the right-hand side or in the top menu labeled "Credentials," "Environment," or "Resources." Selecting the password field in that area will often automatically copy or paste the credentials into the virtual machine.
If you are studying completely on your own through Microsoft Learn and do not have an ALH, you would need to set up a free Power Platform Developer environment. You can register for the free Power Apps Developer Plan using a personal or corporate email address. Then you'd need to follow https://github.com/MicrosoftLearning/PL-900-Microsoft-Power-Platform-Fundamentals
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hth
Marcin