Build an Online Store

Hey, I got this script "[login to view URL]" it GPT script, it works people do tasks to get points to apply in some actions, i want to edit on this system to make them able to buy items with this points like gift cards, beside some edits on appearance like make bottoms flat, add social icons etc, i have the designs in PSD, want to finish as soon as possible, it require skills in PHP and Word Press. Kind Regards.