Do the foil tape trick like Calm said or you can also stick it to a piece of glass that is cut to fit the UTH.
Personally though, while i do like most of Zoo Med stuff, i hate their UTHs. I much prefer either Flexwatt or UltraTherm which is basically pre sized and wired flexwatt.
I actually had a Zoo Med UTH short out and melt on me. Luckily it didnt start a fire but it did put a black spot on the bottom of my dubia colony bin.
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