to sign it
Si usted es forzado a firmarlo, el contrato es inválido.
If you are forced to sign it, the contract is invalid.
Después de firmarlo, ponlo en un sobre.
After signing it, put it in an envelope.
Después de leerlo, tienes que firmarlo.
After reading it, you have to sign it.
Usted debe revisar cuidadosamente el contrato antes de firmarlo.
You should carefully review the contract before signing it.