docs: import btc address

src/pages/mining.md

@@ -74,11 +74,17 @@ After this runs, you'll probably see some installation logs, and at the end you
 }
 ```
 
-We need to get some testnet BTC to that address. Grab the `btcAddress` field, and paste it into [this Bitcoin testnet faucet](https://tbtc.bitaps.com/). You'll be sent 0.01 testnet BTC to that address.
-
 **Don't lose this information** - we'll need to use the `privateKey` field later on.
 
-Now, we need to configure out node to use this Bitcoin keychain. In the `stacks-blockchain` folder, create a new file called `testnet/stacks-node/conf/testnet-miner-conf.toml`.
+The above BTC address will then need to be imported into the BTC testnet network.
+
+```bash
+bitcoin-cli -rpcport=18332 -rpcuser=your-user -rpcpassword=your-password importaddress <btcAddress from JSON above>
+```
+
+Once imported, we need to get some testnet BTC to that address. Grab the `btcAddress` field, and paste it into [this Bitcoin testnet faucet](https://tbtc.bitaps.com/). You'll be sent 0.01 testnet BTC to that address.
+
+Now, we need to configure our node to use this Bitcoin keychain. In the `stacks-blockchain` folder, create a new file called `testnet/stacks-node/conf/testnet-miner-conf.toml`.
 
 Paste in the following configuration: