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When you turn on your phone, it will automatically choose a network within range. Sometimes though, it might be useful to choose your network manually for example when you're abroad where different networks are available (depending on which operators your operator has roaming agreements with). Follow these instructions to choose a network.
Find "Operator selection"
Select network manually, go to 2a.
Select network automatically, go to 2b.
2a - Select network manually
Your phone searches for networks within range.
A list of available networks will show on your display.
Your display will tell you if you've access to the network you've chosen. If you don't have access, it's because your operator doesn't have a roaming agreement with the operator in question.