How can I add another MX record with diferrent Host Name

Hi Wix Community,

Can you help me on how I can add another MX host on my domain?

For example:
when adding another MX record it only popup 1 host name which is:
example@gmail.com

I want to add another MX record with different host name of:
lc.example@gmail.com

did you fix it? can you share the solution please