Dissonant Whispers

Hello everyone!, I am pretty new to D&D as are the people I am playing with. If someone in my party casts Dissonant Whispers what is the saving throw I am trying to achieve? I see that the target must make a wisdom saving throw. On a failed save, it takes 3d6 psychic damage. I see the damage that is rolled in the window once they cast it. I am just unsure what number I am trying to achieve to make the save. Any advice or help is greatly appreciated!!

You are comparing the Wisdom save (d20 + the creature's Wisdom saving throw modifier (just Wisdom modifier if not proficient) ) against the spellcasters spell save DC. If you are using the 5e OGL character sheet, you can find this number along the top of the SPELLS page.

The DC is based on the classes Spell Save DC, which is defined in the class section of the players hand book, or the SRD. Usually the calculation is something like  8 + your proficiency bonus + your spell casting ability modifier

HOLY SMOKES, I have looked at this sheet a thousand times in the past two days and did not even NOTICE that HUGE block that says spell save DC. Thank you all so much for your help. I can't believe I missed it so many times.