you need to first sell POB and get some hive against it.. here is how to do it..

1. Open https://hive-engine.com/?p=market&t=POB
2. Fill in the sell price i.e. 0.051
3. Fill in the POB Quantity to sell, i.e. 100 or whatever amount u have you can see the yellow highlighted to check how much u have that u can sell.
4. click Sell POB button.
5. Wait for the buyer to buy at ur price which u entered in step 2.

1. Once sell is completed, you will get Hive wallet. You can check ur hive wallet.
2. You can Use that hive to Power Up!