Question: Here i developing simple application iphone. I need to create navigation bar with navigation back button in iphone. I'm using view controller page. I want to implement navigation controller. But i could not create back button in next page. I also created navigation bar.

In a 2nd sub view page code is

```
-(IBAction)settingspage
{
    Settingscontroller *objec=[[Settingscontroller alloc]initWithNibName:@"Settingscontroller" bundle:nil];
    navigationController=[[UINavigationController alloc] initWithRootViewController:objec];
    [self presentModalViewController:navigationController animated:YES];
    [objec release];
    [navigationController release];
}

```

In the using this code it will create navigation bar in 3rd sub view. But i dont knw how to create navigation bar with back button in the 3rd sub view page. How to create navigation bar with back button in 3rd sub view using this code. Can anybody help me pls.

Answer: 
Create a key pair on each machine to push to Github, and you can add as much ssh keys as you wish via <https://github.com/account/ssh> page.
Yes. There are to ways :

**First solution**

Yes you can shared your ssh public/private keys to access to your github repository. By default, your keys are situated in the `~/.ssh/` folder (id\_rsa is your private key, id\_rsa.pub is your public key).

---

**Second solution (preferable)**

However, another solution is to create a new pair of keys and put the new public key in [your github account](https://github.com/account/ssh). 

To do that, you can use the `ssh-keygen` command. After that, you put the new `~/.ssh/id_rsa.pub` on your github account as I said above. Don't forget to tape a passphrase when you use the `ssh-keygen` command to have more security.