Resetting netr/w username and password

What is the best way to do the following:

:e ftp://name@server//home/place/ -- wrong username and password
entered.

How do I enter a new username and password?

Several tabs from different systems:

:e ftp://name1@server1//home/place1/ :e ftp://name2@server2//home/place2/

What is the best way to have multiple remote buffers?

Many thanks.
cmn

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