PPP conformity amendment in California: How to file an amended return in Turbotax Business?

We are an S-corp that files in CA. TurboTax Biz for 2022 stated the following: 

 

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Our S-corp did have loan forgiveness that falls into that time period and was taxed in 2021, so we would like to file an amended return as the message suggests. We still have our 2021 version of the software too.

  1. Does anyone have step-by-step instructions for how to actually amend the return as stated above? 
  2. Should we get this ironed out before filing the 2022 return?

Thanks for any assistance.