How do I loop the wiggle effect? [URGENT]

ok so I've been searching all day and night and found something on how to loop the wiggle effect (Dan Ebberts's Expression on Looping wiggle())

He says to copy and paste this code:

 freq = 1; amp = 110; loopTime = 3; t = time % loopTime; wiggle1 = wiggle(freq, amp, 1, 0.5, t); wiggle2 = wiggle(freq, amp, 1, 0.5, t - loopTime); linear(t, 0,  loopTime, wiggle1, wiggle2) 

what do I do with this? how do I loop the wiggle effect?

P.S. Im trying to loop text

All help appreciated.