Step 2: Launch Xcode on your Mac OS X and open MeSNEmu.xcodeproj
Step 3: Under Build Settings, look for Code Signing Identity and change it to your own
Step 4: Select your iPhone or iPad in the Scheme selector
Step 5: Choose Product > Profile > Deploy
When done, open the emulator, and you should see nothing except for a header and the Settings button on the top right-hand corner. Before you do anything, look for ROMs online and use iTunes to install it.
On your iPhone, open up the Safari browser
Go to this website: http://www.iosem.us/app/install/mesnemu.html
Tap on the Install button and confirm again