To use Dvips at its simplest, simply type
dvips foo
where `foo.dvi' is the output of TeX that you want to print. If Dvips has been installed correctly, the document will probably roll out of your default printer.
If you use fonts that have not been used on your system before, they may be automatically generated; this process can take a few minutes, so progress reports appear by default. The next time that document is printed, these fonts will have been saved in the proper directories, so printing will go much faster. (If Dvips tries to endlessly generate the same fonts over and over again, it hasn't been installed properly. See section `Unable to generate fonts' in Kpathsea.)
Many options are available (see the next section). For a brief summary of available options, just type
dvips --help