请问各位关于邮寄信封上内容的问题

下面这是UCRIVERSIDE的邮寄成绩单要求。People's Republic of China

[size=11.818181991577148px]Minimum qualifications: Bachelor's degree requiring four years of university study. Records: (1) Academic records, including a degree certificate, in Chinese accompanied by a complete English translation listing all courses and grades. Grades should not be converted to a US scale All records and translations must bear the original red stamp or seal of the issuing institution and the signature in ink of the appropriate university official. Photocopies of the official stamp or seal are not acceptable. Records must be received directly from the Chinese institution. Records submitted by the applicant will be considered unofficial.

[size=11.818181991577148px]我有2个问题。。

[size=11.818181991577148px]1.signature in ink. 我们学校成绩单是用章封口，没有具体签名。不知这个signature如何解决

[size=11.818181991577148px]2.directly from Chinese institution. 比如我用Fedex邮寄的话，寄件人地址是不是要写我们学校？虽然我是在我家附近寄的。。

[size=11.818181991577148px]3.学校封口过的信封上是否需要写一些东西呢？还是空着更合适些？