To private message someone on Roblox, first verify your account. Ensure your email and age are confirmed in your Roblox settings. Next, open a game on Roblox where you wish to message someone.
In the game, click the chat box at the top of the screen. This will open the chat feature where you can type messages. To send a private message, type `/w` followed by a space and the recipient’s username. For example, you would type `/w username`.
After entering the command and username, type your message and press send. Your message will be sent privately to the specified user. Another way to start a private chat is by clicking the recipient’s name in the chat box. This will allow you to directly message them.