Welcome to the community! Muun currently does not have a Lightning address. A lightning address looks like an email address. For example: sartoshi@yourdomain.com

Some wallets with which you can quickly onboard and get a Lightning address are https://getalby.com and https://walletofsatoshi.com

If you run your own Lightning node later, you can also setup your own Lightning address using a Federate Lightning server. Refer to https://lightningaddress.com/ for more information on those tools.