This page may contain a number of different repeating sections, resembling that shown above or could be a single section with fewer options than those displayed in the image. This depends on the complexity of your requirement for pricing.
Most will have an "Our Price" section with a "Standard £" field. Simply enter your price into this field and click the next or Finish button to complete your changes.
Where you do have a requirement to store alternative selling prices for different channels, marketplaces or currencies, edit these fields in the same way.