Online Formal Application Edits

I submitted my online application, the formal one about a week ago. I received an offer, but haven't accepted it yet. So the background check hasn't begun. But I need to make a couple corrects to my application, a phone number and listing a part time position I had in college, but forgot about until I was going through my pay-stubs and W-2s. Left on good terms, it was just for a few months. Has anyone had experience with recruiters letting you go back to make changes? I tried clicking on the link I was given but didn't see any options to edit.

I believe on background check, you're sent to the website to fill out the information. Contact the HR and inform them of the change.. Go ahead and accept the job.