Translation of "Rellenarlo" in English

Voy a rellenarlo,

might as well complete it,

- Limítate a rellenarlo.
- Rellénalo.

Just fill this out.

Este formulario parece complicado, ayúdame a rellenarlo.

This form looks kind of complicated. Help me fill it out.

Si tu ensayo se te queda un poco corto, siempre puedes rellenarlo con algunas citas.

If your essay is on the short side, you can always pad it out with a few quotations.