When you stake ADA, your account's entire balance is staked at once. Increasing or reducing the staked amount is done by adding or removing ADA from your account.

• To stake more: add more ADA into the staked account. It's staked automatically.
• To stake less: send ADA out of the account. You can do this at any time, no unstaking needed.
• If you change the amount of staked ADA, changes are reflected after 2 epochs.