Use the console instead of the chat window to do commands, and set your echo options in ulx configs accordingly.
Thanks! I found it out right before I read your reply though.
I have two more questions, if you'd be willing to answer them.
1) I run a TTT server, and I'd like for a player to know who killed them. For example, when they die they would see "You were killed by [eG] Tom with rifle." How could I implement this?
2) Is there a way that I could setup an automated votemap? When the map is over, it would ask all players what map they would like and they could vote, instead of having to do !votemap.
Thank you so much for your help!