Your per-word translation fee is the amount that you will be charging per word of the original (untranslated) document.
If you're unsure of what you should be charging per word, try determining what 1 hour of your work is worth, and work backwards from there. Specifically:
As an example, say I want to charge $10.00 for every hour of my work and I can translate 250 words in an hour, my per-word fee would be:
If you're new to the field, you probably should not set your fee higher than $0.07 per word.
Remember, if you're new on the site and your fee is too high, no client will be interested in working with you.