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 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 when finished. Enter your message in the lower text editor and tap "Send".