PhP website source code modification

Hello, I have one website similar GroupOne Clone, [login to view URL] and i want to modify this steps below: 1) In this link [login to view URL] is the Past Deal of the offert, i want to show in the image of value and how many copons are bought and the text Deals has Finish or time is End. 2) where you goo to purchase one Deals is one buttons Bli Tani, i want to add the multi deals here to open 3-5 options to buy the diferent prices of deals. 3) I want to add in paypal method the converter from my courrency to euro. 4) I want to modify the vourchar, i have the image of replace vourchar that i want. 5) I have the options to send sms from my website but i dont know how to link with my sms gateway.