Sigrun's Joining

Just talk to Seneschal Varel about Sigruns joining and she will become a Grey Warden.

(Important)If the Blackmarsh is your last area to finish, do it AFTERItalic text you do Sigrun's joining because the completion of the Blackmarsh will provoke the Final Quest, The Assault on Amaranthine. You will NOT be able to talk to Varel about having Sigrun becoming a Grey Warden because he is busy with other concerns. This is true for Velanna aswell. (This has been tested on the PC version, currently unaware if it holds true for Xbox360 and PS3 players)