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ETA: After writing this post, I just realised that you say you have Milkshape version 1.82. You need to have version 1.85 in order to use it for TS3 or TS4.
Are you able to scroll further down that menu you show in your screenshot? It might be that there are so many plugins installed that you need to scroll down the menu to see the Q-Mesh one.
I set up my Milkshape with all the plugins removed that I'll never use, just leaving the ones I'm likely to use, so my plugin menu is very short, but I
think (can't remember for sure, have had Milkshape for so many years now) that I had to scroll down the menu before I removed the redundant plugins.
If you've installed Q-Mesh correctly, which it looks like you have, the menu entry for it will look as in my screenshot below, where it's the item highlighted in blue.