1) Pricing for "Online" is entirely separate from Desktop.
2) If it's a Windows computer, after you start up TTX Desktop software, there's two "A"s in the lower right corner of the display...one increases the size of the text...the other reduces it..You can change the text size there.
3) If it's a MAC, I don't know if they have a way.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
