There are a few key things you can do to make sure your NSFW channel is properly marked and visible to members. First, you'll want to edit the channel's name to include NSFW or some other clear indicator that the channel contains explicit content. You can also use channel icons and descriptions to further mark the channel as NSFW. Finally, be sure to set the appropriate age restriction for the channel in your server's settings. Doing all of these things will help ensure that only those who wish to view NSFW content will be able to access your channel.