Hakini Mudra is performed by all joining all the tips of the fingers, Thumb ( Fire ), Index Finger ( Air ), Middle Finger ( Space ), Ring Finger ( Earth ) and Little Finger ( Water ), of both the hands and making bottom part of the hands to be apart, it is like pressing the tips of all the fingers expanding the bottom part.
This mudra can be performed during any leisure time, basically this mudra increases intelligence. You can also perform this mudra during talks, meetings etc.. This will help you a lot. Performing this mudra regularly will benefit you with intelligence. It is studied that this mudra promotes the co-operation between left and right side brains.
When you want to remember something, you can also do the following with this mudra. Performing Hakini Mudra, look upwards and while inhaling place tip of your tongue on your gums, and let it fall while exhaling. Now take a deep breath and you what ever you were about to remember will occur into your mind. This mudra not only helps remembering the things but also helps you in making good ideas when concentrated on a particular thing for a long time.