Select articles by Joomla tag

Thanks for the quick reply. The problem is that, although I have upgraded to the last version, in my case this specific field doesn't appear. It appears in another test installation though.
I should also add that both installations are on a local Bitnami server on my Windows 10 PC.

I have already done that. Nothing changes. The Tag field does not appear. It might have to do with the fact that it is a testing site on a local server (Bitnami).
On another installation on the same local server I get the tag field but the linked articles have a wrong id. In fact, it is the same id number no matter which article i choose. I know it is strange but that's how it is.

I would like to do that but as I have said, it is on a local server on my PC (Bitnami). Furthermore, I tried again on a different installation and it worked in the beginning (I could see and use the Tag field). After a while, all the articles form the chosen category started to show regardless of the tags I hade chosen. To make thing sworse, when I tried to edit the Addon, the tag field disappeared again.
I guess, I will have to try it on a live server and see what happens.
Sorry I cannot be of any more help and thanks for answering my questions.

Hi,
I am back as promised.
Tried on a live server and it seems to be working fine
BUT

• although the filed "tags" appears when editing the page in the backend, no articles appear when I switch to certain templates in the Frontend, e.g. Themis template. The header is there but no article titles appear beneath it.

how to sovle it?