@Alexa **********
that means you go to hong kong with your documentation, access the eVisa website, upload the requirements, show the address where you are in hong kong, your proof of legally being allowed to be there, then WAIT there for the eVisa to be approved, then print it and then come back
Why not just pick a nearby thai consulate you can walk in and apply for the visa, go there, apply, pay and pick your passport back up when it's done?