ETH Staking/BETH cost basis

Describe the problem:
BETH cost basis at 0

Which exchange/wallet is this regarding?

Binance
How did you import data into this wallet?

API and CSV
What have you tried to fix this so far?
Talked to Support and they suggested CSV, which I did

Hello,

It’s possible Koinly can’t find the cost basis because the coin isn’t correctly identified in the CSV file. I added BETH to Koinly and I got market price for Eth immediately, but when I used another variation I get your error of $0 cost basis. So maybe that’s the problem. Please check your CSV file one more time for any such issues.

Regards,

Anakin

Sorry, but I dont quite undertsand. How do I check my csv file?