There are three major steps before you can access Curia:
1) Login with a provider of choice
2) Claim your RSI account
3) Claim you discord account.
1) Login with a provider
Step 1 - Open the Curia website in your browser.
Step 2 - Login with a provider of your choice
Note you can login with multiple providers, but you will need to claim your RSI account for each one, discord only needs to be claimed once.