Once you have decided where you want the button, you must insert it there, and here is how you do it.

Go to your edit box and look on your task bar, also known as the kitchen sink. You are looking for the insert more tab button. it will look like this:

And you will find it here:

Now all you need to do is scroll down to where you chose to put the button.

Once you find that spot, Hold your curser over where you want the button, left click the mouse, then go up to the task bar and click the more button.

Click your update button for the post, then then view post button and you are done!