I cannot seem to find where I need to enter a new email password into Thunderbird.

Thunderbird will prompt you for the password when needed.

I get the message that contact with the server failed, but there's no option to enter a new password,

So you don't even get to the point where the password is needed. You'd have to fix the connection problem first. https://support.mozilla.org/kb/cannot-receive-messages

there aren't any saved passwords in the indicated place (I have two email accounts so there should be two).

Did you ever tell Thunderbird to remember your account password(s)?

All of those suggestions have been done, not once or twice, but; many times over including the feature of going into 'Settings' removing accounts, one at a time and reestablishing them with all Correct data again each time without any satisfactory results. Even spent the last three (3) days either in chat session, on telephone or over the NET changing passwords with my ISP/Email accounts and they work on one computer, but; not in Thunder Bird on Linux.

NTLS,

if you aren't the OP, please start a new topic for your problem. https://support.mozilla.org/en-US/questions/new

"christ1,'

I have held membership in this forum for many years and this new setup there is not a place to add a signature file. Never noticed until much later, NO I am not the Original Poster and have created another thread.

Thank you for the link and it is done TIA, CU L8R, 'd' "LoneWanderer"