When providers choose which job to bid for, money is of course an important factor for them to consider. So it is worthwhile to assign a realistic budget to your job in order to attract the right level of expertise. Lowest rate may not attract the best quality or a suitable bilingual provider.
If you really have no idea how much the job should cost, then you can leave the field blank and let the providers bid. But remember the cheapest bid may not always be the best. Remember, you should evaluate a provider’s qualifications, language skills, timeline, and overall cost before making the choice.