How would I make a screen with text on it in Ultimate Doom Builder?

[Waluigi]

How would I make a screen with text on it, like the image I attached? 

I am using UDMF.

[Doomy__Doom]

This is called an "intermission", and is typically* handled by [U,Z,E]MAPINFO (the particular standard(s) you want depend on target source port(s)), which is something you edit into your wad with SLADE, rather than UDB.

 

* for vanilla that'd be dehacked strings, but since you're using UDMF map format that's not really relevenant.

[ramon.dexter]

UDB's sole purpose is making maps and if possible, editting of scripts andialogues. NOTHING ELSE.

[aRottenKomquat]

Use SLADE3, and here's an example of using a MAPINFO lump to define the episode-ending text. It is triggered when the final map in the cluster ends.