1. Click on Add Searcher
2. Select Reddit
2. Insert a * into the Search String Field
3. Choose post, comments or both
4. Choose when you would like to receive email notifications. Daily in the morning, or instantly when the selected match happens.
5. Now insert the Subreddits you want to get notifications for. Note that you must select at least one. Also note that the subreddit names are case-sensitive. Though I will be fixing that soon.