I am trying to load this software to my computer. This will run my 3d printer. However, my forehead is bloody from hitting it against the wall. I am a total noob with limited brain cells. I can open terminal as root. Then it says to go to directory to install. I know this means file. So I went to root and created a file called RepetierHost. I need help from this point on.

The Repetier-Host software has the following requirements:

A recent Linux version
Mono 2.6
Graphic card with OpenGL driver.
optional: Skeinforge for slicing STL files.
Looks like Mono only supports ANSI baudrates, so don't use 250000 baud.

Installation instuctions

become root.
Go to the directory, where you want to install the software. After unpacking you have a new directory in that folder.
Get the latest linux tarball
Unpack: tar -xzf repetierHostLinux.tgz (Name may differ)
Go into directory: cd RepetierHost
Run configuration: sh configureFirst.sh
Make sure your user has permission to access the serial port. On Debian like Linux distributions, this requires membership in group dialout. You can add your user with usermod -a -G dialout yourUserName
Make sure mono and all required libraries are installed. On Debian you can call: apt-get install monodevelop which installs all needed programms and libraries.
If you are running a 64 bit Linux, install the 32 bit compatibility libraries: apt-get install ia32-libs

Now everyone can start the Host by entering repetierHost (in /usr/bin is a link pointing to your installation).

I don't know anything about this software but:

(Note; please put the quotations in quote tabs (or code tabs, if it is code), just so much easier to read - these can be selected from the line just above the text entry box - I'd have included an example, but the system does insist on interpreting them as real quote/code tabs)

Err, that seems all wrong, unless you are confusing me by using words in an unfamiliar way.

The directory that you wish to install in, is the directory that you wish to install in, and I don't know what you mean by 'this means file'. You probably want to have a look at the Linux Filesystem Hierarchy, before you choose where it ought to go.

When you have decided on a suitable location, which won't be '/' (there is a confusion possible here netween the root of the filesystem, '/', and the root user, bith of which are familiarly referred to as 'root'), create a directory. At this point, you want the file that you have obtained (from the internet?) inside that directory.

This will be the 'tarball' (whatever.tar.gz, or similar) file.

Use the commands

Note that you didn't say what distro you are using - for most programs, most of the time, there is a version available from the distro, or its supporters, and which can be easily installed using the systems normal installation mechanism (maybe in a personally supported repo). I'd never heard of repetierhost before, so it may be an exception, but mostly that would be the easier way of installing things, and you would get the advantage of being automatically informed of updates via the system's normal mechanisms.