[Tutorial] Most secure way to add a mailbox into NpcDB.xml

make sure Wrobot is CLOSED when you finishing editing the NpcDB.xml file. otherwise, it just wont save.

The step is:

1: make sure copied all the information to somewhere from the DevelopmentTool panel.

2: Close Wrobot

3: Add the code into NpcDB.xml

4: Reopen Wrobot, after you click "NpcDB" button in the "Tools" tab, you will see what you just have added.

PS: i was trying to add a mailbox, and i did it manually, i typed all coordinates, and it did not save....................(╯‵□′)╯︵┻━┻