General - Switch account

In order to switch to an account that is connected to yours, click on your name in the top-right corner, then on 'Switch to...':

When acting on behalf of another user, the menu bar at the top changes colours from blue only to blue and orange:

When voting or signing on behalf of another user, this setting is clearly marked in the system:

After signing, all the meeting participants or voters can see that the signature was submitted by another user on the main user's behalf: