Amanda Bynes is training to become a nail technician. The 36-year-old star – who started her career as a child actress on Nickelodeon before quitting the industry over personal issues more than a decade ago – graduated from the Fashion Institute of Design and Merchandising in 2019 but is now studying at cosmetology college in the hope of becoming a manicurist. She wrote on Instagram: “In cosmetology college, to become a manicurist!” The ‘She’s the Man’ star – who was under a conservatorship arrangement governed by her parents for almost a decade until 2022 after suffering drug and mental healt…