英语翻译我今年在 petaling jaya 的XX大学买了申请入学的表格文件.而我要修读的科系是在 YY大学才有的中文

This year,I bought the forms and documents for application to university in XX University of Petalling Jaya.However,the Chinese Language major that I would like to apply for is only opened in YY University.But the receipent on the envolope is XX University.
I wonder whether I have to retake an envolope with the address of YY University or it's ok to still use the present one only by changing the address to YY University by myself.
以上为翻译.但是最后我加了一句话,如果你要使用收件人本来是XX大学的信封的话,必须要修改收件人地址啊,否则还是会寄到xx大学的.