Your charitable deduction amount would be claimed on Schedule A of your Form 1040. Your total charitable contributions for the year are limited to 50% of your adjusted gross income (AGI). However, the contributions may be limited to 30% if assets with long term capital gains were contributed. If your contributions exceed the limits then the excess amount can be carried over and deducted in future years (limited to 5 years).
Lines 16 and/or 17 - http://www.irs.gov/pub/irs-pdf/f1040sab.pdf
If the securities are publicly traded then you would complete Section A of Form 8283 and enter the name and address of the CRUT in column (a). You would also complete columns (b) - (h). Since the form is not formatted for CRUTs or CRATs you would need to add columns with additional information such as the remainder deduction factor and multiply this factor by the fair market value of the asset. This information could all be included as an attachment and referencing the attachment on the applicable lines. You should also include the deduction summary from the attorney.
If property other than marketable securities was contributed then Section B would need to be completed.
The CRUT trustee would sign Part IV.