You should read all parts of this documentation, then try and perform the installation. Please do not contact the developers until you have thoroughly read this documentation - we'd rather be improving the software for everyone. That being said - if you do have an unresolved problem, please do get in contact.
The material is organised in such a way that you need only read the installation parts that apply to your platform.
If you have trouble after installation, read the troubleshooting section.