Does anyone know how to change the DNS settings on Namecheap?

Im in the process of setting up a server using nextcloud and a domain name from namecheap. For some reason, I cant seem to get this right. When I look up my server online, it shows a DNS error. I entered my ip info on namecheap, but still nothing. Any ideas what I could be doing wrong?

When I was having this issue, I learned I had only been entering @ and IP address, when I also needed to add www and IP.

So I have to make two entries? One with @ and IP and one with www and ip? I’ll give it a shot, thank you!