See wifi logins on my gateway

I looked on the Xfinity website to find an answer but I couldn't. Can I see who connected to my wifi via my home gateway using a computer from the Xfinity web site? Or is that information only available via the Xfinity mobile app? I also want to see my internet data usage. I believe I used to be able to do this via the website on a computer but now I don't see how to. Thank you.