Beginners are not allowed to do all changes, more important roads and other map elements are locked on certain levels to protect the map for unwanted changes. More on locks, see the Locks page. If you want to change an explicitly locked road or place, place ask in the Slack editing channel for assistance. There are always people glad to help. Example of a starters limit: f.i. a maximum of 30 street names per day may be changed by a L1.