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Just click the questions and you will see a box that says "Know the answer? Add it here!". Click that text or box and then write your answer. When you are finished, click +Add your answer (blue box). 

Btw, welcome here!

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thank you!
You're welcome! :)
where do you see the box that says "Know the answer? Add it here" ?
You can see that after you clicked a question.
The Brainliest Answer!
Well, It's very very easy. Just click the box that says "add it here", then type your answer on the box the box has buttons near the box. There is the bold, italic, underline, paste/edit equation , add symbols, and drop files. Actually you use the paste/edit equation and add symbols for answering math. It is usually used for those who likes to answer math problems, there are different equations:
>new line
>nth root
>less or equal
>greater or equal
>simultanous linear equation
    with two variables
>definite integral

While in add symbols, you don't need to know since you do know it already. But sometimes you cannot answer because of the advertisement that sometimes show below the question or your question. Then after you have already typed your answer, click on the button that says "Add your answer".

this is such a long explanation :D
Well, I hope this helps :)

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