@EmilyMortenson this site isn't where you submit your mileage details. You need to have a profile for logging into www.concursolutions.com, which is a completely different profile from the one you created here on the community.
If you aren't sure if you have a profile, I recommend speaking with your direct manager about it, since they will be the one approving your expenses and should know the process for getting you a profile.
If you manager cannot help, let me know.
P.S. What's impressive about your mileage is it only took 15 minutes to go 7.4 miles. 🙂 I know how the traffic is in the Seattle area.