While filing my 2018 tax return it appears I overlooked/omitted reporting my $6500 I paid into my IRA. Would this have made a difference in my returns?

[VolvoGirl]

Yes it might if it was to a Traditional IRA and deductible.

How to amend an Online return

https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577