You don't have access to their password. You'd have to first change their password to a new one, and use your new password to log in as them. These are safeguards for everyone's privacy so private messages cannot be read by others, for one thing. Also so a person (even a site owner) cannot do bad things under someone else's name.
Because you won't be able to see their current password you can't: change it, log in, and then change it back to what they had to cover your tracks. Thus, once you change their pw, they won't be able to log in anymore unless either you give them their new password or they attempt to change their password via some 'forgot my password' process. They might then suspect what you did if they're savvy.
I've had a couple cases where a member died and I had to decide whether to let their family know they could actually read the person's private messages if I changed the pw and gave it to them. So far, I have not contacted families about that, 'cause I wasn't sure if it would actually be a good thing or not. I wouldn't want to cause them more pain or create a problem based on what they might discover.
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...just another satisfied Jamroom customer.
Migrated from Ning to Jamroom June 2015
updated by @strumelia: 08/02/16 04:02:48PM