How to equip Tenno School skills?

[Zachles]

I guess I missed it in Focus 101, I don't know. How to use? Thanks.

[V45H]

once you beat second dream it should just be hit 5 in game

[GinKenshin]

you go to your operator room and then you see the 5 school with your operator's face in the middle, you equip the one you want and you can use it within missions by pressing default 5 key. you just hover on the school you want and there will be an equip option, the school must be unlocked first ofc, unless it's the school you chose when you finished the 2nd dream  

[Insizer]

This helps quite a bit not only with your question, but other ones related to the Focus system:http://warframe.wikia.com/wiki/Focus

[Zachles]

Perfect, thanks. I had just unlocked it, I thought it was going to be some kind of mod or something I had to equip. I hadn't jumped into a mission afterwards so I was confused.

I like this. I main Trinity and this will give me some more offensive capability beyond my loadout.