You can elect to make voluntary class 2 voluntary contributions if you have added a Self Employment page and your Profit is below the Class 2 NIC limit.
Click on SAVE & CONTINUE
Click on YES
Answer YES to the question DO YOU WANT TO MAKE CLASS 2 VOLUNTARY CONTRIBUTIONS
Tick the box to pay the maximum amount (£158.60 - 2020/21 & 2021/22)
or Enter the voluntary contribution you need to make ( max £158.60)
Click on REVIEW CALC & PROCEED to save changes