Tap the pencil icon from your home messaging screen. Tap your desired contact(s) to select, or enter their username in the upper search bar. Note: Users who are in your organization, or who you have messaged before, will populate in your directory. If you would like to message a user outside of your organization you'll need to type and search their full username in the upper search bar. Usernames follow the format of: firstname.lastame:organization
Tap your contact(s) to select, and tap the green check mark at the upper right of your screen when finished. Enter your message in the lower text editor and tap "Send".