I was told to press a green button to accept an answer. But where is the green button?

How to accept an answer? where is the button, can you print the screen to show the button?

Answer 1

[TAB]

Open your question (If you are reading this, then you have already opened a question).

At the top of each answer to your question, you will see a button tagged with "Accept this answer".

[Walter Roberson]

... click on that button.

Answer 2

[Image Analyst]

We don't know what your GUI looks like. We can't know if there is a green button on it to push or not.