The Benefit Service has a number of online forms and calculators, simply select the one you want.
Benefit calculatorApplication for Council Tax Reduction/Housing Benefit
Report change in circumstancesDiscretionary housing or hardship payment
Appeal a benefit decisionSubmit Online Benefit Documents
Apply for Universal CreditWhen will I reach state pension age
The following three pdf forms can be filled in - you must save them and upload them to the customer portal as images:
Change of AddressChange of Income and Household
Local CTax Reduction - Universal Credit