By Reddit Ads manager shows all of your ads on one page at www.reddit.com/promoted/ when you’re logged in. User ‘flt001’ was having trouble seeing his/her ads on that page.
Turns out they were using an adblocker.
Note when you setup your ads on Reddit you should turn off your adblocker to test and make sure everything is working fine.
You can read more in this thread on the Reddit Ads subreddit.