Unble to change MX record

I purchased domain and emails from Google and added 000webhost nameserver into google domain site. But I am facing a weird issue, like If I activate website by setting up name server then only website work if I set google default then only email works.

I read out in the forum and found that needs to setup google email MX record but I am unable to access it. My domain is nautilustechlabs.com and user id: bipinvaylu. Can you please help me to figure out this issue?

Thanks

Head to set web address manage domain then MX record and enter your new main record

Not following Infinity, Can you please provide some details if possible.

Done?