ssh -- from local/userA --> remote/userB

[bruce]

Hi.

Sorry to even ask htis basic question.

I'm trying to do something like:
 userA: ssh userB(a)1.2.3.4

so I'm on the local box as userA

trivially .. ssh userA(a)1.2.3.4 works as it should with the pub/private
keys established as required.

However, I'm "confused" (missing something) regarding how to ssh into
the remote box as a different user.

Do I have to have a separate /home/userB/.ssh on both the local and remote box?

Does the local "userA" /home/userA/.ssh/config need to be changed to
accomodate some items for the userB?

currently, running
userA   -- ssh userB(a)1.2.3.4

gets
key_read: uudecode
AAAAB3NzaC1yc2EAAAABIwAAAQEArGwWyWyDoO2rlXVg6MjVlAXg8zbzwuNtRaNn9OILVY+YhzAQGmCG5XkQT6ZRICkMfgNo3dAHUtKZsq0nVCdcgCabP
 failed

but I am in the remote box as userB.

Haven't found anything on the net to solve this.. which is odd!

thanks