Connect each switch with individual uplinks to bring them both online and ensure they can check in with the dashboard.
Download the latest firmware build using the Firmware Upgrade Manager under Organization > Monitor > Firmware Upgrades. This helps ensure each switch is running the same firmware build.
With all switches powered off and links disconnected, connect the switches together via stacking cables in a ring topology (as shown in the following image). To create a full ring, start by connecting switch 1/stack port 1 to switch 2/stack port 2, then switch 2/stack port 1 to switch 3/stack port 2 and so forth, with the bottom switch connecting to the top switch to complete the ring.
Connect one uplink for the entire switch stack.
Power on all the switches, then wait several minutes for them to download the latest firmware and updates from the dashboard. The switches may reboot during this process.
The power LEDs on the front of each switch will blink during this process.
Once the switches are done downloading and installing firmware, their power LEDs will stay solid white or green.
Navigate to Switch > Monitor > Switch stacks.
Configure the switch stack in the dashboard. If the dashboard has already detected the correct stack under Detected potential stacks, click Provision this stack to automatically configure the stack.
The single uplink would just be for building the stack in the first place. You'd then create the aggregate link configuration (at both ends), for the addition of your second link. you don't need an uplink for each individual switch.