You can change your registration online 24/7 in My Account.
There may be a change to your premium as a result of this change. You'll see a quote for any increase or decrease in your premium as a result of any changes you have made before you decide to proceed.
If you add any additional premium to your monthly payments, it will cost more than paying it off in full. Accepting the new quote will make the amendments to your policy, and your documents will be updated online.
If you haven't yet registered for an online account, you can do this now. You'll need your Policy Number to hand (this can be found on your confirmation letter or email.)