how to claim credit for FFCRA on form 941

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Hi, 

I am having hard time understanding how to claim the FFCRA credit on form 941.  

I paid $1520.00 total of FFCRA sick leave.  the form told me to annually reduce the liabilities on schedule B, the amount is 1542.04 (which is gross + medicare - employer) 

how about social security - employer?    shouldn't the total credit be gross paid + employer social + employer medicare?   1520+94.24+22.04 

thank you.