Genin ranked ninja or lower are not allowed to leave the village by themselves at any point in time. However in special cases as such missions they may leave with there three man cell and there jounin teacher.
Chuunin ranked ninja or higher in order to leave your village to travel to another by yourself you must do so with your kages permission.
When you leave just simple state in the title of topic where you started from and where you are heading too. Then just role play yourself heading to your destination.