If you want to connect wireless to the UGent network the best way is to use Eduroam. For Eduroam you do not need a VPN client. See: Wireless connection to UGentNet.
To set up a VPN connection, you need to install a VPN client once.
You can install the AnyConnect client from Cisco Systems. Use the following settings:
VPN server: vpn.ugent.be
Certificate: automatic
Enter your username and password.