Edit Data through UserForm

Hi

I have a userform that currently adds data to a worksheet and I was looking to add in an 'edit' button.- not sure about the coding

The fields that can be edited are:
- Requirement
- Name
- Agreed costs
- Supplier Costs

I would like the edit button to edit the existing data, so it will look up the requirement first in column A, then replace the 'name', 'agreed costs' and 'supplier costs' in that row.

I have attached an example on how the data will be stored.

Appreciate your support.

Thanks.