Switching from bulb prepayment to DD - how?

I’m a prepayment bulb customer. I live in the Shetland Islands. There is only one shop on the island i live on where I can put money on my prepayment key. It is 8 miles from my house.

I went there today but their machine was broken so I couldn’t charge my key. A wasted 16 mile car journey.

How do can I switch from prepayment to direct debit?

Thanks

Ian

See: https://help.bulb.co.uk/hc/en-us/articles/360028024111-Getting-your-meter-changed-removed-or-tested

Thanks but I’m not paying for it so I’ll go back to candles and a camping stove.