Need help :(

My PC (HP-550-103na Pavillion) is starting to have RAM issues (BSOD Kscf, IRQL, crashing, boot up problems, ect.), but I'm unsure what ram is compatible with my PC at all, I wanna upgrade to a 16gb (2x8gb) as I use my PC for art and minimal gaming.

I'm unsure how to find compatible RAM, and I've tried afew sticks and they won't fit as some people I know had spare ram but they never helped me in trying to find compatible ones.

I think my motherboard is a ms-7906 ver2.6, from the writing on it. If you need more information please let me know and I'll try to get it. I apologise I'm clueless with PCs.