UCI's portal is terribly confusing and it took me a solid half and hour to figure out where to even find where they posted their decision (decisions usually come in mid to late March).
Picture demonstration time!
Here's the URL to sign into your UCI portal:
You'll need to make an account.
They will post their decision in the first "Welcome" tab, then press on "My Admissions Application". If you have been accepted, you'll need to decided whether or not UCI is the school for you. If you decide that Irvine is the right fit for you, here's the next step:
Accepting their Offer:
That link will take you here:
Once you sign in that link will take you here:
On the otherhand...Congrats! :) Be prepared for a letter to come in congratulating you as well. Frame it. I did...well I want to...