Learn English – How to ask for the meaning of a word or phrase

When someone is trying to explain a concept and use terms that are far too technical for the average person to understand (like your excellent "click the red button" example!) they are often asked to "Speak in layman's terms". They're being asked to stop using technical jargon, and explain the concept in terms most people will understand. This is a very common expression, and I believe the one you are looking for!

You can say

What do you mean?

to ask someone to clarify something they said. Or

What is the meaning of this?

to express outrage at someone's actions or a situation. Or

What is the mean of the data?

to ask about statistics.

Edit

For the ring-in-the-ice-cream scenario, you might ask,

What does this mean?

But really, a ring in your ice cream is so surprising you might simply ask,

What is this?