Dennis Crawford, supervisor of the Lewes Parking Enforcement Department, will host a tutorial on Parkmobile at 10 a.m., Thursday, July 20, in the medium conference room at the Lewes Public Library. The Parkmobile app is a convenient way to pay for parking in Lewes, Rehoboth Beach, Dewey Beach and other cities and towns across the country, using a smartphone. The class will introduce new users to the smartphone app and help folks set up an account and use it for parking. The class is free.