n00b needs help with Paperwhite Screensavers

I apologise for being such a noob in this area.

I have a brand new Kindle Paperwhite. I have never even used one before but would love to customise the screensavers.

I have successfully jailbroken my Kindle, but now I am unsure of how to continue.

Could someone please make a step by step on what I need to do? In noobish format. I have downloaded all the suggested files such as USBnetwork, however, the Readme file put me off a little.

Please :help: