Generally plugins get installed in Program files VST or Program files (x86) VST. I suggest using the former for 64 bit plugins and the latter for 32-bit plugins (I personally just have them all go to Program files (x86) VST and have a subfolder for 32-bit, but it's sloppy and I don't recommend it). Generally Mixcraft will have already put the VST plugins into the list but you may need to restart Mixcraft first. It's worth checking first tho. Next click on the downward arrow where it says and a pop-up list will appear with all your VST plugins in it: Scroll up till you see your plugins and click on the one you want.

How To Install Vst Plugins In Mixcraft

How To Install Vst Plugins In Mixcraft

Download and install your VST file (.DLL) into your VST folder and then restart Mixcraft. Your new VST effect should now be in the effect drop down lists.
If you don't know where your VST folder is, you can create a new one and then add it in the VST Folders section.
To add your own VST folder, go to the Plug-ins preferences and click on Edit VST Effect Folders.
This brings up the following window:
Click the Add button to add your own folder or click the Auto-Scan For VST Directories to try and find one automatically.
Just make sure to put your new VST effect (.DLL) into one of the folders in your VST folder list and then restart Mixcraft and you should see the effect show up in the effect drop down lists!

How To Use Vst Plugins In Mixcraft