How to find correct RAM for upgrade HP Envy 795-0040qd

[Aquinas1]

Can anyone let me know  if this PC has a user's manual because I cannot find it and I'm a professional research librarian.  I want to upgrade the RAM to 64 GB from 32 GB (I have my reasons) and upgrade the graphics card.  There are four RAM modules.  Assistance with finding this info will be much appreciated.  Thank you.

HP Pavilion 795-0040qd Desktop PC i7-9700 Eight Core 32GB 128GB SSD + 3TB DVD+RW

HP HP Envy 795-0040qd Desktop PC 

BASIC FEATURES
9th Generation Intel(R) Core(TM) i7-9700 octa-core processor [3.0GHz, 12MB Shared Cache] w/turbo boost up to 4.7Ghz
32GB DDR4-2666Mhz Memory (64GB Max)
128 GB SSD + 3TB 7200rpm SATA Hard Drive
Intel UHD Video graphic [HDMI, DP]
Super multi DVD+-RW
3-in-1 memory card reader: SD/SDHC/SDXC
External Ports:
Front:1 headphone/microphone combo + 1 microphone-in + 1 USB 3.1 Type-C™ Gen 2 + 2 USB 3.1 Gen 1 + 2 USB 3.1 Gen 2 Rear: 2 USB 2.0 + 4 USB 3.1 Gen 1
SS USB 3.1 (SuperSpeed)
SuperSpeed — New higher signaling rate of 5Gbps (625MB/sec), 10 times faster than regular USB 2.0
Wireless 802.11ac 2x2 WiFi with Bluetooth® 4.2 M2
500W Power Supply
HP Keyboard and Mouse
Genuine Windows 10 Home (64-bit)

I have never posted here before so forgive me if this first message has too much info. 

[Prométhée · Accepted solution]

hi

try scan

Welcome to Crucial USA

[Aquinas1]

Thank you so much.  The Crucial scan does usually work on almost any computer and I know it is good.  I did find what I needed but by a different approach.  For some reason the Crucial scan could not identify what I needed so I just slipped off the side cover and got the info by physically inspecting the currently installed RAM and I found the correct specifications for the upgrades I need.

I appreciate your kind assistance.

[Prométhée]

https://support.hp.com/us-en/product/hp-envy-desktop-pc-795-0000i/19390486/model/28868453/product-in...

it is strange because we find this, although it is not uncommon that we do not have the characteristics page.
But there is not even the model of the motherboard
I had not given the link, but it can be used for the rest