The nudge button appears under the Rally Participation banner when not enough members have entered the rally event.
Only the leader of the house and house officers will see the nudge bell icons, but all rally participants will see the rally participation banner.

Fashion House Leader/ Officers:
To nudge all rally participants, tap on Nudge all. The option to nudge rally participants individually is also available to you.

Please note :only one push notification is allowed to be sent within the house per rally challenge.