I'll bite.
You're going to want to check out
http://www.imagemagick.org/ which will have much more detailed instructions than anything I can give you here.
We're going to make some assumptions here, since you didn't give us a lot to work on. Let's start with your operating system. I assume this is Linux. I also assume you're comfortable with the development tool chain. We're also assuming you have no out-dated versions of ImageMagick installed.
Let's assume you're comfortable with using sites like SourceForge, and that you've got a command line up. Let's also assume you're logged in as you, not as root, for the sake of security.
You're going to want to change to /usr/src:
cd /usr/src
and then wget ImageMagick-6.2.6-0.tar.gz:
wget
http://easynews.dl.sourceforge.net/sourceforge/imagemagick/ImageMagick-6.2.6-0.tar.gz
wget will then fetch this item for you, and deposit it in your current working directory. Now, decompress the archive:
tar zxf ImageMagick-6.2.6-0.tar.gz
Good. You should now have a directory called "ImageMagick-6.2.6" and a file called "ImageMagick-6.2.6-0.tar.gz." Change your current working directory to ImageMagick-6.2.6:
cd ./ImageMagick-6.2.6
and run the included configuration script:
./configure --help
This returns a whole lot of options. Let's work with some reasonable defaults:
./configure --prefix=/usr/local --with-perl --with-gslib
This will configure the makefile for your system, after rooting out all of the installed required dependencies, or failing, and telling you which dependencies you need to install. If you're missing things that you think are important (like JPEG or GIF libraries) you're going to have to install those first.
Now, if configuration was successful, type "make" and go get a beverage or a sandwich. Come back in a few minutes, and you'll see if it completed successfully or not. If it failed, you'll see an error, which you can look up through Google or the ImageMagick forums for more info. Assuming it compiled successfully, type "make install" to install ImageMagick to your system.
Voila. Quick and dirty built-from-source. Of course, if you wanted to do it faster, you could just use a prebuilt binary from the project home page.
Just a suggestion.