Why isn't "?יש לך צבה" correct? Isn't that the same, just a singular you?
yes. It should be correct.
They are both correct.
How many people really know the gender of their turtle?
If you don't know you default to male.
What's the difference between "יש לכם צבה?" and "יש לכם צב?" ?
is a female
I don't have any hebrew keyboard ! How shall I do ?
You can download the duolingo keyboard for your browser. Google it.
On phones you can usually add a Hebrew keyboard as an input language in the settings