If the filtration system does not work, how can someone use the document to solve the problem? by repeating the installation steps described in the document and referring to the diagram
by installing the filter in a different order than the one in the document
by referring to the diagram to come up with another way to install the filter
by installing the heater first to see if that allows the filter to function

A. by repeating the installation steps described in the document and referring to the diagram

The last sentence under "Keeping It Clean" says "If the filtration system does not start when plugged in, repeat the installation steps. If it still does not work, consult your aquarium store." This is pretty much what answer A says.

Here's a photo of Edge just incase, have a good one.

the sun warms our planet, and with the moon, creates the tides. the moon orbits the earth and in turn, the earth orbits the sun. because they appear to be the same size in the sky, the sun, earth and moon work together to create eclipses. when the moon is directly in between the earth and sun

most likely you should find things like facts and important information to you understand. i hope this .