Before posting a transaction to the Bitcoin network, you'll need to choose one of the fees in your Freewallet wallet: Low/ Normal/ Fast/ Urgent.
You can see the default fee amounts before you enter the amount of the transfer: Low = 0.0001, Normal = 0.0002, Fast = 0.0003 and Urgent = 0.0004. Please note that these values will change once you enter the amount of your transaction. The fee depends on the amount of the transaction and the current network load.
Normal fee is the default. Fast and Urgent fees are higher, however, your transaction will be confirmed within an hour and the next block respectively.
The function of choosing fees gives you the convenience to regulate the speed of your BTC transaction.