Can I input information about my Schwab Donor Advised Fund?

Please see this answer from BillM223.

Schwab Charitable is a 501(c)(3) organization, legally able to accept charitable contributions. Because contributions to a Schwab Charitable account receive associated tax benefits, they are irrevocable and legally owned by Schwab Charitable.

Therefore, you enter the amount you contribute to your Schwab Charitable account, not the grants that you may recommend later.

You enter this amount where you would enter other charitable contributions. Do a Search (upper right) for charitable contributions and click on the jump-to result.

As Bsch4477 says above, the contribution of stock will eventually appear on Schedule A.