You can connect two or more Portals using the following methods:
1. Wireless (Adaptive Mesh 2.0)
For setting up your Portals wirelessly please use the mobile app to create one wireless mesh network for your home.
2. Wired bridge
You can connect the Ethernet cable from the LAN port of your first Portal to the WAN port of your second Portal and use the mobile app to seamlessly create one home network with multiple Portals.
In order to use mesh or wired bridge please be sure to perform a firmware update on both your Portals. See here on how to update your second Portal.