Yep there's a button head under the plastic, kind of a pain in the neck (really a pain in the neck you have to get your face underneath somehow).
You can also bring the lever closer to the bars, they have an adjustment wheel. You want #1.
Good first post. Now fill out your profile. Maybe someone can help real close by.
James and Colleen Tucker.
Aut viam inveniam aut faciam
Beat our time, Los Angeles to Ushuaia 70 days