Update DNS from Namecheap to WA

I have just bought my domain at Namecheap and tried to transfer my siterubix website to my own Namecheap domain. When I found there are some changes in Namecheap website, I have contacted Namecheap operator for guiding of DNS changing. Finally, I could transfer my site smoothly.

Here, some instructions from the namecheap operator for transfering of DNS to WA:

Department: Domains Support
Full Name: johnson Butarbutar
Email: jbutar@gmail.com
Your Question: How do I specify my custom DNS (wealthy affiliate)?
Operator: Alex Galtsev

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08:45 Your Question: How do I specify my custom DNS (wealthy affiliate)?
08:45 Please wait, an operator will be with you shortly.
08:46 You are now chatting with Alex Galtsev - Domains Support
08:46 Alex Galtsev: Hello! Thank you for contacting our Live Chat Support!
08:46 Alex Galtsev: May I know the domain name in question, please?
08:46 johnson Butarbutar: working4bitcoin.com
08:48 Alex Galtsev: Thank you, as I can see, to point your domain name to Wealthy Affiliate, it is required to update your Nameservers. if you received different instructions, then please let me know so that I could check.
08:49 johnson Butarbutar: How do I update my nameserver?
08:50 Alex Galtsev: In order to point your domain to custom nameservers, please follow these steps:
08:50 Alex Galtsev: - sign in to Namecheap.com with your username and password and select 'Domain List' from the left side menu;
08:50 Alex Galtsev: - hover over the house icon next to the domain you want to change settings for and click 'Advanced DNS';
08:50 Alex Galtsev: - select 'Edit' next to 'Domain Nameserver Type' section;
08:50 Alex Galtsev: - tick ‘Custom’ option;
08:50 Alex Galtsev: - fill in your custom nameservers under 'Nameservers' section;
08:50 Alex Galtsev: - click on ‘Save Changes’.
08:51 Alex Galtsev: After it, please allow up to 24+ hours for it to propagate.
08:51 Alex Galtsev: And that would be it.
08:52 johnson Butarbutar: Thanks for your helping.
08:52 Alex Galtsev: You are most welcome!
08:58 Alex Galtsev: If there is anything else I can do for you, please let me know.
09:08 Alex Galtsev: It appears that our chat session has expired. We do apologize for this inconvenience. Please start a new chat session in order to receive further assistance or submit a ticket with us at https://support.namecheap.com/index.php?/Tickets/Submit.
Thank you for contacting Namecheap Live Support!