It will take both you and the member you'd like to promote to complete the Head of Fashion House promotion.
Pick the member you’d like to promote and tap one the crown icon pointing upwards.
You will need to tap twice if you are promoting a member straight to head of house and only once if the member is already a house officer.
If you want to cancel the promotion, simply tap on the “x” shown on your Rally about page.
This will disappear on its own once the member has accepted the promotion.

You'll then receive an inbox message once the member has accepted the promotion!