Sign in to Second Life as the avatar that you wish to link to this account.
Once in Second Life, you should see a First Meta ATM in front of you. Click on the ATM. A blue menu should pop up at the top-right corner of your Second Life client.
Click FMX -> FMX website -> Go to page. This should launch a new browser tab/window.
You should land on an FMX page with a prompt. Click "Link incoming avatar to the current account."
Enter your NuVera account username and password, and login.
You should automatically be re-directed back to FMX. On the landing page, you will see a prompt. Click "Link incoming avatar to the current account" to link the account.