So you just got a new smartphone and you're trying to figure out how to use Whatsapp, right? First, you need to download and install the app from the app store, then verify your phone number to create an account. Once you're in, you can start adding contacts and creating groups, it's pretty straightforward. To send a message, just tap on the chat tab, select the contact you want to message, type what you want to say, and hit send. For calls, you can use the phone icon to make a voice or video call, it's really easy. You can also share files, photos, and videos with your contacts, just tap the attachment icon and select what you want to share. If you have any specific questions or get stuck, feel free to ask.