Please go to your profile page, and hover your mouse beside your hourly rate. An "editing pencil" should pop-up, and clicking on that will allow you to update your rate.
Please update your Freelancer profile to reflect your personal information, skills and experience and not your Agency details.
I've sent you the link you can use to change your Hourly rate in a personal message.
Sorry about the confusion. Click Find Work > Profile then hover your mouse over the overview area and you will see the pen icons appear. See the screenshot below: