There are many ways but here one of the ways to do it using WIFI.
1) See this video first.
https://www.youtube.com/watch?v=u7DnqOS1njU
** Notes:
- If you continue to have problems with this just wait for a jailbreak from the DevTeam. It will work perfectly with NO bugs.
- If your iPhone is Unlocked DO NOT do this guide, its only for a jailbreak. Subscribe to stay tuned for my unlocking guide.
- If you have problems with the program getting stuck on connect to itunes mode(recovery mode) close the program, reboot your device by hold home and power for 20 seconds and try the program again no matter what state your device is in.
- If you have an iPod Touch 3G (if it was bought after September 9th this is a tethered jailbreak. That means if you turn your device off and you want to turn it back on your have to plug it up to the computer and run Blackra1n again to get it to reboot.)
- If your new iPod Touch 2G/3G 8g model number starts with MB it'll work, if your model starts with MC it won't. Go to Settings - General - About to see your model number.
- If you get stuck at the part where it says "going into recovery mode" and it stops doing anything, manually put it in recovery mode. If you don't know how google it!
- Some Cydia applications aren't working at the moment. Just be patient they will update them!
2) Download blackrain. http://blackra1n.com/. Install Cydia. Once that is done, use Cydia to install installous. Use Cydia search for the app installous.
3) Download iFunBox. http://www.i-funbox.com/
iFunbox relies on the AFC2 service to access the root file system of iPhones. AFC2 is usually enabled when jailbreak as many previous Jailbreak tools do. If AFC2 serivce is not enabled, iFunbox will recognize it as a jailed iphone and access the file system with AFC service.
Rcently iFunbox is found recognizing iPhones jailbroken by blackra1n as jailed ones. The reason is that the AFC2 service is not enabled in blackra1n’s jailbreaking procedure.
A quick fixup is to install a tiny app from Cydia, afc2add to enable the AFC2 service on iPhone.
4) Installing Cracked ipa files, please see the link https://www.youtube.com/watch?v=X-n2zSh7OFY
Once you have downloaded the ipa files, open up iFunBox and go to the folder user/downloads (there are many ways to get to this). As long as you are in downloads, you are perfectly fine. Copy the ipa file there.
Then, launch installous, and that will install your ipa file.