Click Settings > Security > Backup Recovery Phrase
You will get your phrase.
As it is already said in previous posts, first you should extract your seed phrase from blockchain wallet and import it into Electrum. Then you can use Electrum to extract your private keys.
I'm trying to get some kind of recovery phrase/seed whatever on the security center (for the sake of testing, I have mine pretty well stored), and the only thing I can seem to find about it is a green tick on
Save Backup Phrase
I'm guessing that if it doesn't show a seed when creating the account, you get 1 chance of writing it down? Pretty strange stuff