Hi, I would like to pay using PPC, but I don't understand this:
Step 1. From you Bitcoin/Peercoin wallet, copy the address from which you will be paying. (Make sure it is the address that will be used for payment.)

How do I find out the payment address I'll be using?
And:

Step 2. On this Cart page, paste the source address onto the Notes field of your order. (Look for the Order Notes field above, it is just above the “Your Order” summary.)

What would be the source address?