Wordpress plugin needs fixing

Only apply if you have done wordpress plugins. I had someone else do the wordpress coupon plugin for me through elance because they had done a lot of wordpress plugins. They completed it up to 95% done then asked me to test it. i.e I can install, activate, add, edit and delete a coupon and get it to show on the front end But there are a few things that are not showing correctly and instead of them completing it they have just pulled out ( mainly because their english is not good and they are taking on too many projects and dont have time ) and i think they really didn't know how to do it to begin with. Anyway view the text file to read the rest, vworker doesnt let me have much room to type You cannot distribute, give away, sell or use this in anyway all copyright belongs to me.