To export a GEDCOM from FTM is a very easy task. You have two options, you can either export your entire file, or you can select only those you want to export, and all in three easy steps!!
1. In the "File" dropdown menu, select "Export"
2. Select "GEDCOM 5.5" as this is the standard
3. Select your choice of the entire tree, or only the individuals you choose and select OK.
Three easy steps and you have a GEDCOM!!
I hope this helps!!