I'm using the UMS and would just like the text windows to be fully opaque. I see the word opacity appearing a few times in the script, but changing the values doesn't see to do anything. Which one do I need to change exactly?

Also, how to lower the message screen? I changed what I thought were the Y coordinates of the window, but again, no changes. Do I need to post the script here for you? I'm not sure what the preferred way here is. ( I imagined most people have the ums script already?)
THanks.

First off, move this script under all your other scripts, that might just fix the problem.

To change the opacity either use the code use the in message code: \opc[i] (make sure its a backslash, i forget all the time) for example have \opc[0] for no window and \opc[255] for an opaque window. For a more permanent solution use $game_system.opacity = i in a script call, and again $game_system.opacity = 0 for no window, $game_system.opacity = 255 for an opaque window.

I haven't found any code in there which explicitly changes the y position of the code but i'm pretty sure the normal event method of top/middle/bottom still work.