Exporting a GEDCOM in TMG is a two-part process if you want to include only some of the people in your Project. First, you select those to be included using either the Project Explorer or the Focus Group, as specified below for Step 4. Then, use the File > Export menu to open the Export Wizard. Step 1 is just the welcome screen - click Next to get to Step 2:
On this screen choose Gedcom (*.ged), and specify a file name. The file will be stored in the folder specified in Preferences unless you specify a different location on the Put in Folder field.
Click Next to move to Step 3. The default values are generally appropriate, so click Next again to move to Step 4:
Select the second bullet, next to the name of your TMG Project. Then choose one of the three items below:
Click Next to advance to Step 5:
Choose your desired options:
Click Next to advance to Step 6:
Choose which Tag Types you want to include in the GEDCOM. If you do not want all types of tags included, choose Selected, and a list of your Tag Types will appear as shown above. Select those you want to have included.
You can also chose to include only Primary Tags, and only Primary Names.
Click Next to advance to Step 7. Generally the default values work well. Click Next to advance to Step 8, then click Finish to create the GEDCOM file.