How do you refresh a board inside a iOS mobile app?

Hello all,

How do you force refresh a board inside of the iOS (ipad) app ??
Sometimes we make changes to a board (from user with a PC), but it takes forever for the iOS user to see the refreshed changes.
Sometimes it takes so long that we have to force close the app and re-open.

Please, can you tell me how to refresh the boards inside iOS app?
Thanks !