1. login to blockchain.info.
2. Click Settings > Security > Backup Recovery Phrase > write down your phrase with exact order to import it later using Electrum wallet.
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Are you sure this url still works ? Url has been changed to
https://www.blockchain.com/OP, follow this steps:
Security Center => Backup Phrase or Backup Funds => Backup Now => Write 12 words in sequence, and store them in a safe place while offline. Complete the steps and get a private key. You can use phrases in other wallets and control them more easily without having to login to the site
https://www.blockchain.com/.