The eject button on the remote appears as an upward-pointing arrow with an underline - see below image. The eject button on the TV has a similar symbol.
However, I suspect that in your case, you might not be having a Remote.
This link says that your TV doesn't come with a Remote and DVD cannot be ejected without the remote :
VEON 19 LED TV DVD FREEVIEW COMBO A1823511 1