Have you come across a nice Web Gallery template you can download and use, but don't know how to install it in Lightroom? If you did or do, here's how it's done.

1. Extract the downloaded zip file. 
2. Copy the archive contents to one of the following destinations, depending upon your system. If you have not already done so, you should create the Web Galleries folder manually. 
3. Mac Users: Users/username/Library/Application Support/Adobe/Lightroom/Web Galleries/
4. Windows XP Users: C:\Documents and Settings\username\Application Data\Adobe\Lightroom\Web Galleries\
5. Windows Vista & Win7 Users: C:\Users\username\AppData\Roaming\Adobe\Lightroom\Web Galleries\

In Windows XP, the “Application Data” directory is usually hidden. The same may apply to the AppData folder in Vista & Win7.

Open Adobe Lightroom and access the Web module. In the upper right, under “Engine”, you should see your new gallery. Have fun.