Register a USI REGISTER A USI Signing up for a USI is a simple process that you'll be able to complete online in just a few minutes. All you need is acceptable forms of identification and access to email. Step 1 Fill out the straightforward USI Application Form Step 2 You'll receive your USI by Email. REGISTER FOR A USI I'VE FORGOTTEN MY USI I'M READY - LET'S SIGN IN