"Bridge mode"? It's just "the bridge".
And you can get to it by clicking on the arrow under your mini-map. A menu will pop up, and among the choices will be "Visit your Bridge". Click, and voila.
Hope you understand, the Bridge of your starship is, essentially, just a cosmetic feature at this time. You can't play the game from it or anything.
oh ok thx do u know if they are going to make it so u can play from youre bridge
It's been flatly stated quite some time ago that it's not in the plans, and will more than likely never will be. As Jeslyn pointed out, it's been pointed out to be more complicated than it looks considering the current set up of the game.
Personally, I'm fine with the way it plays now. Bridge Commander is fun and all, but I like it that STO is it's own thing.