Some actions, depending on their nature, may have quite a large impact on your account, or the site which you're managing.
In these cases, we throw up a confirmation window to ask you to confirm that you really do in-fact want to perform the action. (See the screenshot below)
In this case, we ask you to type the actual word "CONFIRM" in capital letters. This is more reliable than a window that says something like:
"Do you really want to do this? Yes. No."... and you accidentally click the wrong one.
When prompted, simply type the word: CONFIRM
...and click OK to proceed.