Can you change a Iphone passcode from a computer?

You can change the passcode by restoring the device to default settings provided you have the apple id login and password associated with the device using itunes with a computer. You will need the device plugged into the same computer to do this.

No.

Locked Out, Forgot Lock or Restrictions Passcode, or Need to Restore Your Device: Several Alternative Solutions

1. iOS- Forgotten passcode or device disabled after entering wrong passcode

2. iPhone, iPad, iPod touch: Wrong passcode results in red disabled screen

3. Restoring iPod touch after forgotten passcode

4. What to Do If You've Forgotten Your iPhone's Passcode

5. iOS- Understanding passcodes

6. iTunes 10 for Mac- Update and restore software on iPod, iPhone, or iPad

Forgotten Restrictions Passcode Help

You will need to restore your device as New to remove a Restrictions passcode. Go through the normal process to restore your device, but when you see the options to restore as New or from a backup, be sure to choose New.

Also, see iTunes- Restoring iOS software.

No, The only thing you can do is restore the phone. The only way you can change the password is restoring it or knowing the old one

Nope, Kappy's suggestion is what needs to be done. You cannot 'change' the passcode without the passcode. The device needs to be restored, per Kappy's post.