Follow the below instructions to review Schedule O, Supplemental Information to Form 990 or Form 990-EZ:

1. From within your TaxAct return (Online or Desktop), click Federal. On smaller devices, click the menu icon in the upper left-hand corner, then select Federal 
2. Click Schedules to expand the category
3. Click Schedule O - Supplemental Information to Form 990 or 990-EZ

Per the Form 990, Return of Organization Exempt From Income Tax Instructions:

Page 5: C. Sequencing List To Complete the Form and Schedules

In general, first complete the core form, and then complete alphabetically Schedules A–N and Schedule R, except as provided below (in instructions).

Page 82: Appendix E. Group Returns—Reporting Information on Behalf of the Group

In general, if a line requires a Yes/No answer and the answer isn't the same for all subordinate organizations to which the line applies, then check “Yes,” and explain the answer in the schedule's supplemental information section (if applicable) or in Schedule O (Form 990 or 990-EZ).