What I want to ask is does this computer can get new graphic card ? And how can I assemble it ? Also what kind of graphic card should I get to not get the GPU bottleneck ? P/S:Sorry for my bad English and the computer details is here https://support.hp.com/in-en/document/c04874664
You can't really.
Per the specs page:
Discrete AMD R7 A365 GPU: Permanently soldered to the motherboard and is not in card form factor
There's also no Thunderbolt, so an eGPU using that is out of the question.
However, I would strongly discourage this, as it'll be extremely difficult to actually modify your PC to work as such.