[ZeroCool2u]

You can just go here: https://aistudio.google.com/prompts/new_chat

Select Gemma 3 from the drop down on the right side.

[tadamcz]

This doesn't explain how to get API access

[ZeroCool2u]

There's a big blue button on the top left that says "Get API key" and after you perform a prompt in the UI there's another button that says "Get code". Between those you should be good to go.