I have been sent a new activation key where do I fill it in please?

I have been sent a new activation key where do I fill it in?

Menu > Help > License.

If there is already a license activated, you first need to click on deactivate.

how and where is that done?

In eM Client go to Menu > Help > License and click on the activate button and paste in your key.

If there is already a license activated, click on the deactivate button first.

Oh, that is what I said above. You havin’ a laugh?