switch library

[Jodybug72_]

I cannot switch to another library and sign in.

[sjpt]

Can you please give more detail?

What program are you running?

What has worked so far?

What exactly are you trying to do that doesn't work? 

What form does the failure take?

What do you mean by 'another library'?  (the word 'library' has different meanings in different contexts).