Okay, ‘Tis not a problem’. You’re correct in saying that if you did not use a guitar (fretted) instrument as your primary instrument, the tablature options are not visable. I would think the simplist option would be to simply change the ‘voice’ into a guitar. Of course, if you wanted both you may wish to duplicate the voice instrument before changing it.
To duplicate> Goto Setup mode and right click on the instrument and select ‘Duplicate’
To change instrument> Open the card for the player and click on the right chevron and select ‘Change Instrument’ - and then select a guitar of some sort.
PS. A few of us here are getting on in years but please don’t get dishearted. At some point we all got our ‘lightbulb’ moment - I’m sure you’ll get yours.