They'll send you an email when your first installment invoice is ready. (I did this a few weeks ago and it took nearly a week to get the first invoice. I was starting to think I'd done something wrong lol!) Then you just sign into macphersons and go to your layaway and unpaid balances and you should see the link to pay the invoice. It'll take you to the PayPal link if that is how you want to pay. I hope this makes sense!