How to enter RSU sell to cover when date acquired and cost basis are not available?

On my 1099-B, I have 3 different transactions:  "Units Sold 8", "Units Sold 1", and "Units Sold 12".  The date acquired and the cost basis are not available.  These units were sold to cover taxes on grants of 23 units, 3 units, and 36 units, respectively.  The remaining units were not sold and are being kept for now.

 

I have been back and forth between the forms and the "Step-by-Step" and am getting nowhere on how to enter these transactions properly.  

 

Complicating all of this is that the transactions were done in Euros but on my 1099-B they're in US$.  

 

Is there a way to get some guidance on how exactly to enter these in?