RSUs and Adjusted Cost Basis

My husband receives RSUs from his company. In 2020, we sold more of that stock than we normally do. When I was filing our taxes, I came upon the question/flags about entering my Adjusted Cost Basis for each sale. I do not ever recall getting this prompt in the past. 

 

I pulled out the ETrade records and started entering the Adjusted Cost Basis (the Cost Basis had been recorded as $0.00. With each entry, my liability decreased dramatically. When I was done, I owed 79% less than when I started. In an excited panic, I hurried to purchase the larger TT support package. And then I just filed-- which meant that I am no longer eligible for the help I had just paid for. So here I am-- asking the community-- did I totally screw up or did I do it correctly?