re :however in the setting it still shows my old Spectrum PW and I can't change it.

Did you do this:

• Settings > Privacy & Security'
• Scroll to Passwords section
• click on 'Saved Passwords' button
• Click on 'Show Passwords' button

For a pop account there should be two lines - mailbox://account and smtp://account

• Right click on mailbox line and select 'Edit Password'
• Completely clear all contents
• Type in new password
• Repeat for the smtp line.

I'm wondering if you have got the correct settings for the Pop accounts. It's possible you set up the account as a pop account but recently got bad advise on server settings. So let's be certain this is correct.

Please post the following information:

• Help > Troubleshooting Information
• Scroll down to 'Mail and News Section'
• Post an image showing everything in that section.

The next section is for information in future. But do not start adding any more accounts until we have checked out the original one which should already be using the Global Inbox.

re : I can't find anyway to associate my email address with the original INBOX that Thunderbird set up, I don't want to have 2 inboxes..

All Pop accounts get auto created as their own account with their own set of folders. You saw this when you created the new pop account - assuming it is a new pop account. Thunderbird does not auto set up deferred accounts - aka also known as 'Global Inbox' This is something you would have had to do when you created the account. Only Pop accounts can use Global Inbox.

In Account Settings

• Select 'Server Settings' for the account:
• click on 'Advanced' button

To set up as a deferred account using Global Inbox:

• Select 'Inbox for different account'
• Select 'Global Inbox (Local Folders)'
• Select checkbox 'Include this server when getting new mail'
• Click on 'OK'

Then check the following are all pointing to use 'Local Folders' account.

• Select 'Copies & Folders'
• For each - Sent - Archives - Drafts - Templates
• Set all to use correct folder on 'Local Folders'

• Select 'Junk Settings'
• Select 'Move new junk messages to'
• Select 'Junk folder on and choose 'Local Folders'

Then restart Thunderbird.