My cash is already in the stock. Can I just transfer the stock to my Roth IRA?
No. A deposit to an IRA must be in cash. A conversion from traditional IRA to Roth can be "in kind" i.e. As a stock transfer. Last, any withdrawals can also be in stock or funds.
By the way - now on page 7 - "Contributions, except for rollover contributions, must be in cash."