This option should be towards the bottom of the screen you list. If it is not, this suggests you either do not have the Premium version of MM (what does Help>About show your version as being?) or, more likely perhaps, you have not fully activated your version. Check under Help>Activate edition.
There is definitely something wrong with the installation of MM on your computer. The Folders screen on my installation looks like this:
As you will see, there are a number of additional "options" which are not shown on your screenshot! (Some of the folder locations are "personalised" to suit my workflow, hence they are not "standard".)
BTW, to add a picture to your post, simply click on the blue circle with the upwards-pointing arrow at the top of the Add Comment screen.
I think this problem is one which you will need to pursue with Magix Technical Support here, though other users may have met this problem and be able to offer more useful help.
Did you go through the routine of downloading and installing everything that was unlocked in the Store? Follow this tutorial. Once done, you will have the VST path on the folders screen.