Read the Wiki as it will explain how to get the most out of iMIUI! Firstly, you will need the following tweaks from Cydia - we've also created a list of optional tweaks that we recommend:
Required tweaks
WinterBoard Give your iPhone or iPod Touch a graphical overhaul (Free, by Saurik: default Cydia repo)
JellyLock (Beta) An awesome lock screen replacement (Free, by Max Katzmann: ModyMyi repo)
BytaFont Change system fonts (Free, by iPhoneRuler.net: BigBoss repo), download Roboto Light/Open Sans Condensed Light
iWidgets Place HTML widgets on the homescreen (Free, by eldwin: ModMyi repo)