Since this keeps popping up, I'll mirror the Tutorial content here (though with a slight variation), and add a little bit of detail.
The >FUEL TANK/ENG message pops up to notify you that you need to configure the tanks such that each TANK is fueling an ENGine (TANK per ENG, or TANK/ENG). If you look at the FUEL page, you will see that the only pumps running all four engines up to this point are the OVRD pumps in MAIN 2 and MAIN 3. These pumps are heaving fuel out of these tanks to keep all four engines running, and the reason you're running all of the engines off of these tanks is that they can hold a lot more fuel than the outboards (think of the profile of the wing here). Once the inboard and outboard tanks are all at the same level, though, there's no longer a reason to be heaving fuel out of the tanks, so you turn the OVRD pumps off, and then set the engines up in a way that they all draw from their own tank (this also ensures that if there's a leak in a line between one of the tanks and an engine, you're not going to affect more than one engine, in theory).
Things you will see in the half-minute video:
FUEL TANK/ENG will happen when all tanks get down to being even, at about 30.0 (or 120.0 on the upper EICAS)*. Knowing this, I have the EICAS up to confirm the message and tank levels.
The OVRD pumps are turned off, and then the lower EICAS FUEL page is checked to verify that the individual tank pumps have taken over.
The outer crossfeeds are closed.
The final configuration is verified on the lower EICAS FUEL page, and the message is verified cleared on the upper EICAS.
I'll add this info to the Intro as well, as I'm sure it will help to have it there, too.
* 13.6 (or 54.4 on the upper EICAS) for those who use kilograms.