Looks like HP's site is down for maintenance at the moment, so I can't use that. From what little I could find on Google, it looks like your laptop has a single RAM slot that currently houses 4GB of RAM. You should be able to drop in 8GB no sweat: http/www.amazon.co.uk/dp/B00KQCOTCM
I had looked at that page as part of my research but it only lists the as-shipped config, not the maximum configuration that can be used. Here's what I'm going off of: http/h10032.www1.hp.com/ctg/Manual/c04653884 It shows that there's only one slot that has some factory configs of 8GB, so I can't imagine there being a problem with aftermarket RAM.