Don't worry. It happened unintentionally. No issues. Please remember, only a Timeline Monitor (TLM) doesn't need any others approval to get his TL entry updated.
Keep on contributing to the site like this. Once you earn sufficient experience and TL counts, the owner of this site (known as the Moderator) will definitely promote you as as a TLM.
If...
more... you are interested in other topics, there are other types of Monitorship to get promoted to as well such as PNR Monitor, Refresh Monitor, News Monitor, Atlas Monitor, FAQ Monitor, Forum Monitor etc.