MAIN TABS (the top row) Illustration below Tab1 shows no MAIN TABS identified same for SUBTAB
Figure 1 – MAIN  TABS  installed DEFAULT to 7 MAIN TABS    
 
Figure 2:  MAIN TABS shown all tagged (7 MAIN TABS) to another MAIN TAB
If you right mouse click on a main tab the Pop Up gives users multiple choices:
Figure 1:  MAIN TAB Right Mouse Click Pop-Up 
 
This Pop-up allows you to Add, Edit and Delete Tabs. 
Choose the "Edit Button" and type in the Button Text ie., Music   and choose a color for the button   Click OK
 
Figure 3:  Editing a MAIN Tab to reflect MUSIC as tab naming and giving the button a color other than Default Gray
 
Figure 4: First MAIN TAB  above reflects Music and color. Next step is to name the first SUB TAB go to next section in 
this manual.