To get TM WhatsApp on your device, first find a safe source for the app. Download the TM WhatsApp file from the trusted source. If needed, enable installation from third-party sources in your device's settings. After the file downloads, find it in your device's storage and start the installation. Follow the on-screen prompts and permissions requests to finish. Then, open TM WhatsApp and go through the setup, which usually involves verifying your phone number. After that, you can use TM WhatsApp with its extra features.