Only the broker can trade stocks. If it's a website, that means the 18 year old or adult. If you get an adult to make an agreement to a broker ahead of time (like verbal agreement or some kind of understanding) then this actually happens. It happens all the time.

Some charter schools make this a course..... You need to get permission but that's about it.

I understand that , what I meant by trading stocks is purchasing them using my money from my checkings account . And some company's offer "DRIPs" such as Walt Disney correct ? ( and thanks for the answer !!)

Hello , I'm 14 years of age and I would really like to begin in the stock market . I opened an account with fidelity(custodial) and I have a student checkings account with Wells Fargo . My question is can I trade stocks with my bank account or must my guardian trade the stocks for me ? Thank you !