Please note: this is a very difficult hand position [mudra] unless you have very small hands. The hand positions are not mandatory and are optional. Just skip the hand position if this is in any way difficult for you. The vibration is the key here, and you should be relaxed. Trying to force your hands into the mudra is a distraction. Mudras should be comfortable.
To open the throat chakra, fold your hands together as in the photo, thumbs touching side by side; do not fold the thumbs. **This hand position is difficult. For those of you with larger hands, it can be skipped. It is best to be relaxed and not in any pain or discomfort while performing these exercises.