Visa ni kansuru

When you use "regarding ---" at the beginning of a sentence, you can translate like the following.
「～に関して(は)」(--- ni kanshite(wa))
「～について(は)」(--- ni tsuite(wa))

thank you sammyoobaさん and chikoさん
thats really helpful

Regarding visa~... it means 'ビザについて' or 'ビザの件'.