Do you mean change between assault, engineer, support and recon?, They are the boxes at the top on the deploy screen. You have one saved loadout for each class which you set up in battlelog, but you can then change any of them before you deploy each time.
No not change class. I have set up four presets for my weapon config. Changing between them in game doesn't seem obvious how to do it.
For example for my engineer class I have four presets:
Large map (long range weapons plus anti tank weapons)
Close range (short range weapons plus anti personnel weapons)
Anti aircraft (long range weapons plus anti aircraft weapons)
Large map with vehicle (long range weapons plus vehicle repair)
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