You don't have to pay for it at all. However, you might WANT to pay for it, because then you can go past lieutenant, play maps other than Emerald, use water units, etc.
Click the button labeled "Single Player", then click on "Training", and play all of those. Then play at least one game against the AI (and preferably continue to play the AI until you can beat it) by using the same sequence except you click "World War" instead of the training button.
When you're done with that, the main menu has a button marked "Multiplayer".....use that to head towards playing against other humans.
_________________ Q: How many ADHD people does it take to change a lightbulb?
A: Oooh look, a kitty!!!
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