My guess is that the guide was removed with the forum revamp a while ago. I can tell you that you can enter decoration mode by clicking one of the icons at the edge of your minimap (it looks like a bundle of flowers and is only visible when in your house or garden). For other questions you can check out my guide or ask on these forums.
Originally Posted by Tsudonym
Fordil of Landroval, Minstrel officer of The Alliance
Check out my Guide for New Players: https://www.lotro.com/forums/showthread.php?507561-GUIDE-New-to-LOTRO-hints-and-tips