I can't access it in my Cubase 7.5

I"m sure this has been covered many times before but even though I did a search, I couldn’t find exactly how to install bought VST plugins so that they appear in my insert list.
I just bought the Waves SSL E Channel and I have it on my computer but for whatever reason, I can’t access it in my Cubase 7.5. I have successfully installed plugins before but it has been a long long time and my senile old brain has forgotten the correct procedure. :blush:

Can anybody simply walk me through the exact steps that I need?

All help would be greatly appreciated.

Thanks in advance.

There is a dedicated chapter on how to „installing and managing VST plugins“ in the manual IIRC.