The lobbyist is paid or somehow compensated in exchange for lobbying state government:  attempting to influence the passage or defeat of legislation by lobbying the governor, members of the legislature, or their staff members or lobbying a state agency to set rules, rates or standards. "Legislation" includes "any other matter that may be the subject of action" by the Legislature, so lobbying includes contacts with legislators and their staff about potential legislation as well as possibly efforts to educate them about an issue or an organization. 

The lobbyist must register within 30 days of contracting to lobby or before lobbying begins, whichever happens first.  The registration must be updated if any of the information changes while it is in effect.  The PDC has an online filing system available for lobbyist registration and reporting.