Backpack my custom block script. The inputs are the same as a regular say __ for __ seconds block. The only difference is that this is cooler B). No, there's a difference. It writes it a letter at a time. If you want it to stay on forever, I suggest getting rid of the for (length) seconds part, and getting rid of the say (speech) for (length) seconds part, then backpacking it. There is also a think __ for __ seconds script.
I saw the Scratch Emojis Tutorial and thought I could do the same thing (linked here): https://scratch.mit.edu/projects/1027409445/editor/ NOTE: Even though the code is the same, I didn't copy. This is just the fastest way to do it.