It's the green app with a white phone and chat bubble icon.


If this is your first time opening WhatsApp on your phone, you'll need to set up WhatsApp first.
 You'll see this option in the top-right corner of the screen.


If WhatsApp opens to a conversation, first tap ← in the top-left corner of the screen.
 It's at the bottom of the drop down menu here.
 You'll see this option near the bottom of the page.
 It's at the top of the page.
 It's in the middle of the pop-up window here.


You can also choose other invite options like Facebook or Twitter, though none of these methods send a message directly to a friend or group of friends.
 You can select as many names as you like.


Any names that appear here are non-WhatsApp users from your phone's contacts app.
You can use the search bar at the top of the screen to search for a specific contact.
 It's in the bottom-right corner of the screen. Doing so will open a Messages window with a link to WhatsApp.


If you only tapped one name, you'll see Send 1 Invite instead.
 Doing so will send your invite to your selected people. If they download WhatsApp, they'll be added to your WhatsApp contacts list automatically.
Open WhatsApp.
Tap ⋮.
Tap Settings.
Tap Contacts.
Tap Invite a Friend.
Tap Messages.
Tap contacts' name.
Tap Send Invites.
Tap the send button.
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