ADA Staking Advice

Hey everyone, I am completely new to the staking game so please bear with my stupid questions. I sent 10 Ada from my exchange wallet to my daedalus wallet and then i decided to stake my ADA. It deducted a transaction fee and said 2 ADA was deposited. Now I am not sure, Is the 2 Ada that is deposited the ADA staked or the 7 ADA i have in my wallet is staked. Secondly can i unstake the ADA I staked and can I get the 2 ADA deposited back? Thank you in advance for your replies and help.

The 2 ADA are the cost for staking, will not included in stacking amount and u will receive them back when u de-register the stake address