On my slot i only have 5 classes to choice from. How do i unlock or get the MAX? thanx for your help in advance.
MAX is already unlocked for your usage, you just don't respawn as one, you need to go to a infantry terminal and switch to it.
You can't spawn as a max from the redeploy screen, you need to go to an equipment terminal (the ones with the gun symbol over them) on a deployed sunderer or at any base (a common place is in the same room you spawn in) and select the max class from there.