No-one is asking you to enter programming code, not yet anyway. If you're not comfortable with this kind of thing stick with Outlook 2013 (or use the apps others have suggested).
If you get a response like this it means that autodiscover is running on the server you queried. The response you get in your browser is useless because the autodiscover service is only useful for Outlook clients - but if you're *not* using Office 365 you can
go ahead and try putting the server name in the hosts file like I suggested above. If it works, then great. If not, you probably need to go back to Outlook 2013 until your admin enables autodiscover (which is the proper way to get this working).
If you're on Office 365 there may be another way to trick Outlook 2016 Preview into working. You'll need to use regedit, so you'll need local admin access and usual caveats apply - If you're not sure, don't try.
Firstly, create a text file containing the following:
<?xml version="1.0" encoding="utf-8"?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
<Account>
<AccountType>email</AccountType>
<Action>redirectUrl</Action>
<RedirectUrl>https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml</RedirectUrl>
</Account>
</Response>
</Autodiscover>
Save the file somewhere on the PC that's running Outlook 2016 Preview. It's probably worth putting it somewhere you can remember and giving it a name that tells you what it is so you don't delete it later.
Next open regedit. Navigate to 'HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\AutoDiscover'
Create a new 'string value' called whatever your email domain name is i.e. 'businessname.com' - no quotes.
Double click the new value and enter the path to the file you just created. Again, no quotes.
Next create a 'DWORD value' called 'PreferLocalXML' - no quotes.
Double click the new value and give it a value of 1.
Now try Outlook 2016 Preview again.
It worked for me, I hope it works for you. I don't know why MS decided to remove the manual configuration from Outlook 2016. It seems misstep to me too.