Hello.
You'd achieve that in Map Settings -> Edit Script. In Unearth if you click 'Help' there's a link to the scripting commands for KeeperFX: https://github.com/dkfans/keeperfx/wiki/New-and-Modified-Level-Script-Commands
Keep in mind LEVEL_VERSION(1) must be at the top of the script if you're using the KeeperFX scripting commands.
The copy-paste solution is here - copy these lines to the bottom of your script:
QUICK_INFORMATION(2, "Second message.", ALL_PLAYERS)
QUICK_INFORMATION(1, "Welcome to my map.", ALL_PLAYERS)
I don't have much experience with DK scripting myself, so asking me anything is the same amount of effort as figuring it out yourself. Check out the DK discord: https://discord.com/invite/zKTjfDh
There's a bunch of people there who love to answer scripting questions and solve bugs with the game. I don't know what's up with the taunting, if you don't want to use discord you can create an issue on the keeperfx github: https://github.com/dkfans/keeperfx/issues
It might even be considered a bug with the game, in which case it should be reported.