How to use coin/exp boosters

[eNx_]

How do you use boosters like I get that thing a lot but don't know how to use it, can anyone tell me?

 

[susaura]

Hello.
You click the Head in your inventory, then go to the Emerald "Network Boosters" and then once your there, click on "Personal Boosters" which is your head again
Hope this helps!