So Mordecai went and did all that Esther had instructed him.

Esther 4:16
"Go and assemble all the Jews who can be found in Susa, and fast for me. Do not eat or drink for three days, night or day, and I and my maidens will fast as you do. After that, I will go to the king, even though it is against the law. And if I perish, I perish!"

Esther 5:1
On the third day, Esther put on her royal attire and stood in the inner court of the palace across from the king's quarters. The king was sitting on his royal throne in the royal courtroom, facing the entrance.

So Mordecai went his way, and did according to all that Esther had commanded him.