If you have multiple allocations, you'll want to make sure your usage is being attributed to the correct allocation. You can see which allocation you're using at the top left.
If you need to change the allocation, click on the area next to the OpenStack logo that says "tacc * TG-xxxxxxxxx" and it will show the allocations you can select. Chose the appropriate allocation from the list.
After giving it a descriptive name, press the blue NEXT button.
This should be a non-routable subnet. You can use 10.0.0.0 - 10.255.255.255, 172.16.0.0 - 172.31.255.255, 192.168.0.0 - 192.168.255.255.
If you're not sure what to choose, you can go with 10.1.1.0/24 → this will give you 255 available addresses in the 10.1.1.0 domain.
If you choose 10.1.1.0/24 you can then set the gateway address to be 10.1.1.1
Then press the blue NEXT button.
Each project has its own firewall rules. You will need to add at least an ssh rule to allow yourself to ssh into your instances.
Click Create Security Group
You should see your new SSH rule in the list.
You'll also want to add a rule to allow ICMP
You will need to upload at least 1 ssh public key in order to access the instances you create. This assumes you already have an SSH key pair that you use. If not, you can create a key pair via this screen.
Note: Jetstream recommends and only supports using RSA-based SSH keys or ed25519-based keys.
With the network, security group, and ssh key setup, you should be ready to launch an instance.