Retirement tax questions

Thanks for responding!    I feel so helpless.    More about my situation: 

  • I was claimed as a dependant 
  • I made 10,040 in 2021
  • I claimed 300 on my charitible contributions  12b    

The big question I have is where it says  on  line 12b  "if you take standard deduction (See instructions)"       I  cant find any instruction on the instructions page that tells me what to do.       

 

I don't understand why  IRS is telling me to send a schedule A