Ooooooh, it's down in the chapter full of GM-stuff, I see. I wasn't gonna go digging through that but after your statement I figured it had to be.
I am still not 100% sure I understand the rules, so I am still re-reading. But basically, you have this pool of Fate points, that you are constantly spending/hoarding. You can use a Fate point to take one of your aspects, say "Has a Big Mouth" and use it to influence what's going on...So you could spend a point, say "But damn my character has a Big Mouth and is going to shout him down." and use that to get a reroll or a bonus on your roll.
Perhaps the party is looking for something but hasn't really started yet, so as the scene is being set you can say "My character has a big mouth, so by now half the starport knows what we're looking for' (which might be good or bad depending on how the GM takes it). It doesn't affect your rolls, but it sort of affects what is going on, in the scenario, in a general sense?
You can use the SAME thing to get a Fate point added to your pool when the party is in some delicate negotiations and you say "But damn my character has a Big Mouth and can't keep it shut." and offends the negotiator making life harder for the party and themselves...And then you add a point to your pool?
...And because Aspects are sort-of-weirdly-general 'does it work? then use it!' I suppose you could use 'Has a Big Mouth' in an eating contest, too? Or trying to bite something?
But I don't think I understand Tagging aspects you don't have?
EDIT: I have been reading this
but I am still not really sure I understand tagging.
Some of the ideas I am kicking around are:
Mouth Like an Espatier Drill-Sergeant,
Wind Her Up and Watch Her Go (Berserk),
and Awwww, Isn't That Cute! (Shockingly incompatible with the two above)
...But I think I need to think about more 'story' ones, probably.