In most cases you need to load the gedcom into a program such as GRAMPS or others that are recommended in the help files.
Most feel that not more than 100 persons should be uploaded to WT at a time due to the work it takes to complete the profiles.
If you load the gedcom into a PC based program you should be able to get that list of people to you want. I have not tried a gedcom from FS, however I know a gedcom from Ancestry does not contain enough information in the source/citations to meet the need of WT, work is required to fill out the citation.