how do i make safari as my browser?

I assume you mean how do you set Safari as the default browser.

If so it is easy to set.

Go to System Preferences and select "General". (it's the top left button in the preferences panel)

After you click "General" there is a option halfway down the page for "Default web browser:"

Click that and it will give you a drop down list of options. Click "Safari".

Your webpages will now open by default in Safari.

You can't download Safari independent of the operating system. What operating system are you even using? If you're using Windows, Safari is no longer available. If you're using a Mac, you should already have it on your computer.