That you can do from your limits page in your profile. You only need to click on the “Edit” button for the limit you wish to raise/remove and either enter a higher amount or click on “Disable”.
When this has been done a confirmation email will be sent to the registered email address were you just need to confirm the raise/removal. In 7 days from this moment the limit will be raised/removed.
As the limits are there for responsible gaming reasons and to protect you from your playing over your budget for a certain period of time. It takes 7 days to remove/raise a limit so you can not on an impulse go over and beyond the limit that you have chosen for yourself.