Creating a new group will be done under your My Team tab by locating the Groups tab.
Start by clicking New Group at the top:
You will be able to do three things when making a new group. Start off by giving it a name to make it distinguishable. You can then check all the coaches and athletes that should be a part of this group. Once you are satisfied, slick submit.
You will now see your new group in the groups tab:
You can message a group by clicking the chat box on the right side:
A chatbox will appear at the top right of your screen. Type a message to send it to the whole group: