Answer:
The correct ones are ''escribir su nombre'' and ''escriba su nombre''
Explanation:
''Escribes su nombre'' and ''escribas su nombre'' are<u> not correct</u> because those sentences translate to ''you write his/her name'' and ''write his/her name''.
However, the other sentences are <u>correct. </u>Here are some examples:
''Guys, you have to <em>write your name</em>'' translates to ''Chicos, tienen que escribir su nombre''.
''Please, <em>write your name</em>'' translates to ''por favor, escriba su nombre''.