Question

How to use underbrace ?

Answer 1

what exactly do you mean by this?

Answer 2

\[\huge \underbrace{\text{Hello!}}_{\text{Shayaan_Mustafa}} \]

Answer 3

Hey.. How did you do this?

@asnaseer look I mean this as Ishaan94 did.

Answer 4

Shayaan: you can see how this is done by right-clicking on the latex that Ishaan typed above, and then selecting:
Show Math As -> TeX Commands