With p0sixspwn untethered jailbreak, you can download & install Cydia for your idevice. Please make sure, your device running on within iOS 6.1.3, 6.1.4, 6.1.5, 6.1.6 before proceed.
Cydia download (with p0sixspwn jailbreak)
Cydia download (with p0sixspwn jailbreak)