Translation:That is your cat.
Yours = milikmu. If you say "That cat is yours" it would mean "Kucing itu milikmu".
Itu = That Kucing = Cat Kamu = You/Your
Itu kucing kamu = That is your cat.
To say possessive noun of 'you', it can be shortened 'mu' and put after the noun, so it can be itu kucingmu, and also itu kucing kamu, both are corrects.
Hope it's helpful!
I assume you're doing your lessons on mobile, so you don't have access to Tips available only on PC version. Here's the link for this particular lesson: