Installation process of Facebook register (connect + login) module on own hosting does not require any kind of additional actions. Below you can find detailed instructions related to module installation + videoclip about installation of MyPresta modules.
Installation guide of MyPresta modules
Video guide
Please note that this installation instructions are related to other module, but you can install pretty clean urls plugin in the same way. It is just universal way to install modules. Especially modules from MyPresta - our modules do not require advanced installation / modification process. Just follow the steps and during "upload" use fblogin.zip file (module library downloaded from my orders section).