Click the leader’s icon to go in to the Team Interface, you can pick the characters, upgeade weapons, choose mob skills and arrange your backpack.
The Strikeer can have the max attribute but have limitted time;
Every time you upgrade 1 equioment, it need additional item in the next time;
Mob skills can be upgraded, once you get the same after battle;
If your backpack is full, you can delete something of it.