Easy way? Download an app like wallet of satoshi, ZBD or blink get you lightning address and paste it on the "lightning address" section of your profile.
Discussion
Wallet of Satoshi is not available in my country. I will try your suggestions.
The zbd wallet address provided is not supported by Damus. It is not in NWC form.
You don't need an nwc. On your profile click edit profile and you'll see a "lightning address" section. Paste it there
My lightning address is supposedly invalid since it does not begin with “LNURL”. My wallet is: lnbc20n1pn0ederpp5mwtls39k3h3jt9g9qqkdclj2qh66qphpnafptk8jly2pkcfnptmqdqvtfz5y32yg4zscqzzsxqzjcsp50cf2083kd7k2v7r5krzmh3pzjsvr3jxy6qj74wc6xxcp0wnuvqhq9qxpqysgq332n4twsdqcwye022s2hnjcjy82h8jk26hywjtf42uwjex0gec980pqz7gvlnd3ru43l0f3g5u9dgaz0u94mjhc6szt53f5hqx46r3cqlgasjn