Look for the Tile App in the Apple App Store to download and install on the phone. Open the app which you first need to log in with or create a new Tile account. You will also need to turn on Bluetooth to communicate with the Tile Slim.
Make sure to enable location tracking on your phone since the Tile doesn't actually have any location tracking itself. The Tile App uses your phone's GPS location as the location for your Tile assuming both are connected over Bluetooth. The Tile App also tracks all the phones which has the Tile App set up with your Tile account.
To finish the setup, you simply need to click the Tile logo on the Tile Slim. If you have another phone like an iPhone 6 Plus using the same Tile account connected over Bluetooth to a Tile device, the Tile App would report that the Tile was connected to the iPhone 6 Plus.
Overall it is easy to set up and pair the Huawei P10 with the Tile Slim over Bluetooth. You can use the phone to find the Tile by seeing its location on a map or playing a ringtone on the Tile. You can also find your phone by pressing the logo on the Tile Slim a couple of times or from a computer or another phone.