Installing can be quite simple to do and also very dangerous as you install something, it completely wrecks apache and now your web server wont start back up again. Well worry not, its very easy to uninstall anything that you have installed. The first thing you need to know is that the name of the package changes from the name of the original file that you downloaded and installed. You will first need to perform a search of everything that is installed to get the name of the package you are looking for. Using grep will make this way easier.
rpm -qa | grep packagename
This will generate a massive list of all of the packages installed on your system if you run it without the grep. Once you have found the name of the package you want to install run the following command to uninstall an RPM package from your system.
rpm -e packagename
If the RPM that you installed was part of another application such as an apache module, make sure to run the command to restart the application in case it has crashed with the install of the RPM.
Thankfully this is very easy to perform. You can begin to get over the mini heart attack you had when your server went down now 🙂