Search:

Dragon & fly scans translated it as "the one who knows how to re-equip", which would obviously mean Erza, considering that he already set up a connection between the two, it'd make sense.

Chapter 144 if you're referring to Lucy's Urano Metria.

Giving it a little momentum is probably enough for it to move towards it's target.

Really looking forward to the entrance of the straw hats like everyone else, Oda is setting up everything nicely....