You must enable Spam (Junk) settings for each of your accounts: Go to Account Settings >[Account name] > Spam Settings ... (see first picture) Then click on "Global Spam Settings..." in the lower right corner which will open the Settings > Privacy & Security > Spam settings (second picture)

Please describe what happens when you set that in settings>privacy&security.

Thank you for the responses.

I tried to answer before but something went wrong. Anyway, Its kinda interesting. In my thunderbird there 'spam' is not even mentioned one time. I have been through all things in not only account settings but others as well. For some reason, now, its even stranger. Right now, for instance, the only thing that the option to press to make it junk is one that I have been trying to make junk for a long time. A while ago the junk option was greyed out - on everything! I have no idea what to do. I have updated, etc. and that did nothing.