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Create your first bot:

Go to Power Virtual Agents marketing page and select Try Preview. Sign in using your work account.
If you don't have a license, you can sign up for one by following the prompts.
In the Create a new bot dialog box, enter a name for your bot. This can be something generic to your company or specific to the scenario you are tailoring your bot to.
Your virtual agent is created in the default Power Apps environment for your organization or tenant. Usually this is sufficient, but if necessary you can choose a different environment by selecting More options to see a list of available environments.
Select Create to begin the bot-building process, which can take up to 15 minutes for the first bot you create in an environment. Subsequent bots take less than a few minutes to create.

During the building process, you'll see a notification at the top of the Power Virtual Agents portal indicating that the bot is still being built.
You can navigate to some tabs during this period, after which the banner will change and you'll have full access to the Power Virtual Agents portal.