The Twin Butte Bunch range is located 7 miles west of Rexburg, Idaho. Just take the Hwy 33 exit at Rexburg, go west 7 miles, and the entrance to the range is on the north (right) side of the highway.
Or, if you’re on I-15, take the Hwy 33 exit and head east for 12 miles.
Here's an aerial view. Just zoom out to see Hwy 33 and Rexburg.