You can easily download and install the latest releases of ioctl by typing the following command in a terminal window:
Using curl:
# install ioctl latest stable
curl https://raw.githubusercontent.com/iotexproject/iotex-core/master/install-cli.sh | sh

# install ioctl latest unstable build
curl https://raw.githubusercontent.com/iotexproject/iotex-core/master/install-cli.sh | sh -s "unstable"
Once ioctl is installed in your system, you must configure the endpoint of an IoTeX full node that acts as a Gateway to the network. Anyone can install an IoTeX full node and configure it as a gateway. Here we will use the public endpoints provided by the IoTex team for the mainnet and testnet networks: 
# Point ioctl to the IoTeX Mainnet
ioctl config set endpoint api.mainnet.iotex.one:443

# Point ioctl to the IoTeX Testnet
ioctl config set endpoint api.testnet.iotex.one:443
→ ioctl full reference