You are able to edit it directly. If you are on your profie, you should see a pencil (I think it's a pencil) when you hover near your hourly rate. From there you can click and adjust it.
I checked your account and I was able to see the pencil icon right next to your hourly rate. Could you please try using a different browser or try clearing your cache or cookies? Please let us know if you still don't see it from your end. Thank you!