What will i do if i change my p.o box then it already forwarded my application as fiancee visa in USCIS?
Answer:
I am not sure what you are asking. If you change your address, you need to notify uscis.
If you already started an application and you are afraid your mail will go to the old PO Box, make sure you have filed a 'forward mail' form with the US Post Office. USCIS could easily make a mistake since your application will have the old address. You might want to go to uscis.gov and see if there is anything else you should do.
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