i want to know if Backtrack 5 supports HTC Touch HD
Is there a documentation explains how to install it?
The only way to find out is to try it. There's a readme in the download that walks you through the install.
Of course, if you really wanted to have some fun, go to Wal-Mart late at night and ask the greeter if they could help you find trashbags, roll of carpet, rope, quicklime, clorox and a shovel. See if they give you any strange looks. --Streaker69