No one is going to make a video showing you how to edit a text file.
In the Hypseus folder, there is a file called hypinput.ini - Open that file in Notepad and edit/change the lines:
KEY_START1 = SDLK_1 0 0
To:
KEY_START1 = SDLK_1 SDLK_RETURN 0
If that doesn't work, change SDLK_RETURN to SDLK_PAGEUP and try again.
Try:
SDLK_RETURN
SDLK_PAGEUP
SDLK_PAGEDOWN
SDLK_VOLUMEUP
SDLK_VOLUMEDOWN