2. Connect the watch to the mobile phone. You can connect via Bluetooth or Wi-Fi, depending on the model of the watch and mobile phone.

3. Open the app store on your watch and search for the application you are interested in. If there is no app store on the watch, you need to find the application you are interested in on your mobile phone and make sure it is installed on your mobile phone.

4. Install interesting applications on your watch. If you can't find the interested application on your watch, you need to open the watch management application on your mobile phone and install the interested application.

5. After the installation is completed, open the interested application on the watch and set it according to the instructions to start using it.