510508 Fix Issues - Penny Auction website

We have a Penny Auction website which is working very well. But after running for a while we find some issues or errors that we think we need to fix before continue. Issues are not too big hard issues. I think we have total of 4 or 5 issues. One of them is required field Validation issue. and other one is we are not able to alter the shipping cost of any product. And rest are few other small issues. So we need someone who can fix it in max of 2 days. Because we cant turn off the website more than that. So bid only if you can do that. Else don't waste ours and yours time. Also attach the previous work samples.. Write Bids on first line so that I can check you have read the Job. Else you will be rejected. Thanks