1. To increase/decrease delegation just enter the final amount.
For Example: You delegated 100 SP before. Now you want to delegate additional amount of 50 SP. So, you have to enter 150 SP.
If you want to decrease this amount by 35 SP. Then, you have to enter 65 SP.
2. To withdraw delegation just enter the SP amount 0.
N.B. After withdraw Delegation you have to wait 5 days(cooling period) to get your SP back in your wallet.
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