Increase monthly direct debit

How do i increase my monthly direct debit…i cannot find in my bulb account…

On this page top right hand side try clicking on sign in I think that takes you there.

Sign in to your account and select “Tariff and account info”.
Scroll down and select “Edit payment settings”.

198kHz November 8, 2018 6:28PM Flag Sign in to your account and select "Tariff and account info". Scroll down and select "Edit payment settings".
The issue maybe finding the part `sign in to your account` I struggled to find a way in when I replied to the poster. Its certainly not clear. They possibly need a box headed your account.