how can I get a 30-day free trial?

[HwangAhhyun]

I want to use the Gemini feature through Looker Studio Pro. 
I want to try a 30-day free trial before using Looker Studio Pro, 
but I don't know how to do it. When I go into Looker Studio, 
it says there is a Looker Studio Pro Upgrade item, but I don't have it. 
Why is that? Also, how can I get a 30-day free trial?