<p>Ended up accidentally starting the SIR process a while back. I'm stuck in step 3 and I can't find any option to go back or to decline my admission. The only thing I can do is to go forward to the next steps but I don't want to accidentally submit my SIR as I have already done so to another UC.</p>
<p>I’d advise you to call the admissions office and explain your situation. I don’t think you’ve officially submitted your SIR though, since you haven’t made the deposit. Still, call to make sure!</p>
<p>also:</p>
<p>"If you’ve changed your mind and want to decline the offer of admission from UC San Diego after you’ve already accepted, you can log in to MyApplication and click the Cancel My Admission link on the MyApplication checklist.</p>
<p>Or send an email to <a href=“mailto:sirdecline@ad.ucsd.edu”>sirdecline@ad.ucsd.edu</a>. Be sure to include your name, application ID number, and a statement telling us that you are declining the offer of admission."</p>