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How to turn on boost

I know this might sound stupid but I'm new and don't see a boost button.  Can someone explain to me how this feature works.   Tired of getting passed on the straight aways when people boost past me.   Thanks for the help

Hello. This is not the right topic for this question but let me help to you. 
After the 3rd lap the game unlock the drs and boost feature. After the 3rd lap you will see a red battery with 100% at the left side of your driver’s profile picture. Just press or click that battery. The boost start working until you hold down that button. I hope it will be helpful! Go ahead and keep developing! 
Roland

One more question can you tell me how to turn in dsr?  I've read this is also driver controlled.  Thanks

DRS turns on automatically.

Note: the car getting drs has to be 1 second or less behind the car in front by the time it gets to the drs activation line

Gotcha thanks