How ANY Alliance Member Can Write Group Messages
Click on Alliance and open the alliance information screen.
Click the Members tab to access the list of members.
Now click VIEW on any member to view that member's statistics.
Here, you'll have the option of messaging that member, so click WRITE.
When your blank message appears, notice the little check box by the recipient's name? Tick this to send that message as a group message.
It costs 2 Speakers per message - in other words, write out your message, send it to the whole group and you'll use up two of your Speakers.