POST Problems. Not understanding istructions

Hi, newbie here…
Not sure if this is even how this place operates, but here goes…
could someone explain, in simple terms, how to complete the below task…

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To verify the CAPTCHA solution, make a POST request to https://api.friendlycaptcha.com/api/v1/siteverify with the following parameters:

|POST Parameters

solution|The solution value that the user submitted in the frc-captcha-solution field|
|secret|An API key that proves it’s you, create one on the Friendly Captcha website|
|sitekey|Optional: the sitekey that you want to make sure the puzzle was generated from.|

You can pass these parameters in a JSON body, or as formdata.
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