Need Help With Domain Name Buying Process

I went to get a domain from namecheap.com signed up and was going through the process. Then I came to name servers and didn't have a clue what it was or what to do...
(Below is the page)

SELECT DOMAIN REGISTRATION OPTIONS

NAME SERVER SETTINGS
Use Our Free Name Servers
You should use our name servers if you want to take advantage of our free features like email forwarding, URL forwarding, dynamic DNS etc. If you are not sure, please leave it at default.
Use Custom Name Servers
Please enter Name server Name Only (ex: ns1.mydomain.com). Don't enter IP address.

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* It is advisable to enter at least two name servers if you choose to use your own custom name servers.
* Please note that if you are setting up DNS servers for .uk, .eu or .ca domains, use the IPAddress--dns.name format (ex: 12.12.32.22--ns1.domain.com).
Also,if you are registering other tlds along with these tlds (.uk, .eu, .ca), please note that IPAddress--dns.name format doesn't work. So, please register these domain separately from others for proper setup.

URL FORWARDING SETTINGS
This setting is valid only when you use our default name servers.
Enter URL
Use Namecheap's Default Forwarding URL
Choose URL Forwarding Type

EMAIL FORWARDING
This setting is valid only when you use our default name servers.
Default E-Mail account @<sld.tld>
Forwarded to (your e-mail ID)

Sooooo confused any all help welcome