Verb
embezzle - To secretly take money that is in your care or that belongs to an organization or business you work for
The accountant was convincted of having embezzled money from the company, people were surprised that he had been doing it for 10 years before it was discovered.
tinker - To attempt to repair or improve something in a casual way, often to no useful effect
Mitch tried to tinker with his computer before realizing that it was more broken that he had thought, and that he had to bring it to the computer store to have a professional repair it.