I started with a Toodledo account first and tried it out for a few days. Then I Installed the "ToDo" app on my iPhone (not the Toodledo app). I did a sync and it somehow was able to put things into it's Inbox and it made sense. So I couldn't figure out how to get an Inbox here on the website.
I see some are using a folder, others are saying all uncategorized task is the inbox etc. Just wish there was a more elegant solution on this site.