Are you referring to editing a proposal that has been sent already? Please know that proposals cannot be edited, and re-submitted, as this is not a feature supported by the website. As such, we highly recommend for freelancers to double-check their proposals for grammatical or spelling errors before submitting their proposals.
An option would be to withdraw the proposal, and send out a new proposal. As a gentle reminder, please know that withdrawn proposals will not refund the connects used it. The new proposal submitted will be charged the appropriate number of connects accordingly.