I don't know about Edward Jones, but most stockbrokerage firms either mail monthly statements to their customers or keep those monthly statements available online for a couple of years. Most monthly statements show the position including cost basis. My suggestion is to dig up your cost basis from before you donated the stocks to the donor advised fund and enter them into TurboTax.
The donation is reported on IRS Form 8283 which requires cost basis.
https://www.irs.gov/pub/irs-pdf/f8283.pdf
