first if your iphone is disabled or locked then these steps are for you .
Step 1: Step 1 Conecting Your Iphone to the Computer
step1- plug your iphone into your computer press the power button & the home button hold it until your screen goes black & wait for the apple sign pops up then let go of the power button & then keep holding the home button .
Step 2: Step2 Restoring Ur Iphone With Itunes
step2 - if you dont have itunes then you have to go online & download it off of apple.com because for this step your going to need itunes. once u do do steps one and 2 step three is easy on your computer open up itunes and i t should pop up with two things to click on restore iphone or check for updates like in the picture .uyou wanna click on restore iphone and let itunes do the rest of the work to restore it
Step 3: Step 3:setup Your Iphone
after your done restoring ur iphone u have to go thru the stepsto set it up