¿Cuándo juegan?
This means when do they play. Putting ellos in the sentence is not necessary.
Are you asking for the translated sentence?
If so, I believe it would be "Melissa throws lies." Echa is a conjugated form of Echar which roughly translates to "to throw" and Mentiras <em />translates to "lies."
This may not be completely right, I'm sorry. www.spanishdict.com is a good place to find answers too.
Answer:
Estoy COMPRÁNDOME un helado.
Prefiero caminar las calles.
Your'e Welcome!