Press the flag, and then press the spacebar to start talking! Then just listen to what Fundy tells you to do! There could be this bug when you need to press an arrow and it is not working, tap the tick without typing anything in, and then press the needed arrow key.
Credit to Dream Team Wiki on Fandom for the pics and Fundy for inspiring me in coding! So basically I was just bored and then I decided to surf scratch and I found this trend "Talk to a character" so I decided to code this awesomeness.