Don't know about Hillerange (weren't they built by Seaward?), but we also have a three-burner range/
oven which is out of production . . . Mobilite - originally built in Finland. Fortunately it came with manuals and looks/works like new. Perhaps ours
lights similarly as yours.
The
oven is very simple to light. After opening the
oven door, I turn the
oven dial to the "ignite" icon and using a butane lighter-stick, light the bottom burner via a small round orifice, located centrally and forward of the
oven's bottom. The blue flames should then be seen spreading to the entire bottom burner.