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1. Locate the Power button which is varied depending on your iPhone model: on iPhone 6 and newer, you'll find the Power button along the right side of the phone, towards the top. On iPhone 5 and older, the Power button can be found along the top edge of the phone.
2. If the iPhone is already on, you just have to unlock the screen. If the iPhone is off, you'll need to keep holding the button until you see the Apple logo.
3. Release the Power button when the Apple logo appears. The Apple logo indicates that your iPhone is loading. It may take a minute or so before your lock screen appears. 
4. After booting up, you'll have to unlock the screen before you can start using the iPhone. For iPhone 5 and newer, you have to press the Home button to unlock the screen and enter your passcode. For iPhone 4s and older, you can slide the screen to unlock it, then enter your passcode.

 Source: www.wikihow.com

The word ‘locate’ in ‘Locate the Power button.’ (step 1) has similar meaning with ....