A few questions.

1) Whats better to fight mirror, Fire or air?

2) How can you tell if you can add a Weapon upgrade or not?

3) At what city can I change my 2nd class?

1) Try it and see how it goes. Or, you could use that nifty search function on the forum for mirror tips...

2) Depending on your type of weapon, you should be able to add any parts you find for it.

3) There's a place in the desert where you can change your secondary profession, but I won't say any more than that. Just explore the desert and you're sure to find it.

1 ) Fire imo, only take Fire storm, meteor shower and meteor. The mirror is not gona move and he will drop pretty fast ( i droped him in 30 sec or so )

2) If your weapon has has a preffix or a suffix.
You can only have one suffix and one prefix on your sword.
Suffix or prefix is something like
Staff of defense
Zealous sword...

3 ) ill be more nice than the other one ( no offence )
You can change secondary proffesion in destiny gorge and 2 other city in the desert ( not exaclty sure about the 2 other, but i know for a fact that in 2 city in the desert you can change secondary proffession

3)do The Hero's Jouney quest that you get at Draknors Forge and you will find most of the quests to change secondarys

I found where to become Mo and R, but I wanna be Me atm.

i think mesmeer is at destiny gorge

Okay, thanks guys I got the answers I needed.

But just because I am useless, I got another one.

Can I capture an Elite while having an Elite eqquiped?

Yep, you will then have two elites on your bar. When you enter a 'city' though they will be removed.