@Korrawit
Your machine has Intel® Core™ i5-7200U (2.5 GHz, up to 3.1 GHz, 3 MB cache, 2 cores). It specs
https://support.hp.com/au-en/document/c05301840
The manual (page 2) says
On computer models equipped with an Intel Core processor:
Support DDR4-2133 Dual Channel
Support for up to 16-GB maximum on-board system memory
Well, on-board means soldered to the motherboard. It currently has 4 GB DDR4-2133 SDRAM (1 x 4 GB) means 4GB in one slot. Hope the second slot is empty. If yes, you can add 8GB more using part on page 58 of the manual. You can use part number to order from HP or buy elsewhere such as Amazon
Please get more information from the following manual
http://h10032.www1.hp.com/ctg/Manual/c05226489.pdf
Regards.
BH***
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