On the EQ Launcher, click the gear icon in the bottom left-ish of it, it should bring up a list of options, click Open Game Directory, this is where your Current EQ is installed, put the maps in the /maps folder in this. It would be good to have a sub-folder inside the map folder though, so the game doesn't overwrite your maps when Patching.
To get to custom subfolders in map folder just choose the folder on the drop down on the in game map.