Where to find candidates in the Blades? (The Elder Scrolls 5: Skyrim)

the mercenaries in the taverns, housecarls (Lydia for example) and all those who agree to travel together to lead them to Dolphin ( not more than three) and then the dragon watering

Go to the Dolphin with his companion and he, like obedient sheep, will swear HER allegiance.

I understand this is not non-binding, what Lydia can take back.

thank you friends!!!

NightHawkreal
Impossible, they are doomed.

Impossible, they are doomed.
Well, in the sense of taking in partners is possible, but they will live in the heavenly harbour.

I have the dolphins even a branch dialogue, no to partner ... took the blades.
The head of the greybeards didn't, maybe because of this?

hitrov2011
The head of the greybeards is not to blame. You just need to come with a partner and talk to the Dolphins.

Question - what is actually necessary?

be sure to kill the head of the greybeards otherwise will not give the quest to find the blades

Serano can