Welcome, welcome to Shabbat. Shavua Tov Umevorach, simchot (celebrations), b'ezrat Hashem (with God's help), Yosef, chatan (groom) b'karov (soon), Amen.
There's a question: If a person says, “Are you allowed to make Jell-O on Shabbat?” So what's Jell-O? You take hot water and put it into a bowl. That's Kli Sheni (second vessel). Then you take some powder, this Jell-O powder, and put it in. You mix it up; it's nice and liquidy, and you put it into the fridge, and it becomes Jell-O. Can you do that on Shabbat or not? Well, there are two possible problems. Number one is lash. You're making a batter, right? Making a batter. It's not a problem. Why? Because it never becomes a batter. It's liquid. It stays liquid. There's no issue with that, right? So that's not a problem.
The second possibility is nolad. Why? Because you're creating something new. You know, it's a question. Can you make ice on Shabbat? Sepharadim, Rabotai, hold: you can make ice on Shabbat. It's not a problem, nolad. What about Jell-O? Same thing: Jell-O does not become a problem because even though it's nolad, there's no nolad here by food, and therefore it's not a problem. So making Jell-O on Shabbat is 100% okay, okay. Of course, they say you should probably put it in the water first before you put it in the powder, but Al Kol Panim (in any case), you're allowed to make Jell-O on Shabbat. Have a wonderful, wonderful day.