Hello. My name is***** to JustAnswer. I'm reviewing your question now, and will post back with your reply momentarily.
You can upgrade this model for ram, up to 8 gbs. However, ram isnt easily accessible and HP does not recommend it
for this model. (lots of conflicting information on this model due to the inaccessibility issue)
You only have one slot for upgraded ram here and will need another ram piece that is 8 here:
You can also buy the version that already has 8gbs here or look at it and compare prices:
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Yes, you can review that option here: