Look at the
wiki. In this section are two components TAChart and PlotPanel.
To be able to tell what went wrong with installing the component, you have to give more information. But the easiest way is this:
1. Place the sources for the component in a subdirectory in $Lazarus/Components/
2. Install the package from there.
With a "standard" Lazarus install the $Lazarus/Components/ directory (and its subdirectories) is in the search path, so Lazarus will be able the locate all the files needed for your component.