Singature on custom made PDF file required

Signature in custom made PDF file is required. ## Deliverables Hi, We are a small freight forwarder. Attached is a airway bill (AWB) we use every day for our customers. That AWB was custom made for us and lacking 2 things which we want you to create for us: 1. We want to be able to scan and enter a signature in the field "Signature of Shipper or its Agent". It has to be in blue color. Various Adobe forums offer different methods on how to put signature into the file, I tried them all, but none of them worked. I assume it's because our file is custom made, so the only way around is through programming changes, but I am not sure how. If current PDF file can not be programmed the way I want to include a signature, please suggest if you know any other software where we can have the same functionality as we have now plus an ability to insert a signature. 2. On the attached file you can also see some numbers for the rates. Those rates nicely are calculated and 2 totals appear on the bottom left part of the AWB under Prepaid column. But not the Total Prepaid field which we always have to calculate manually. For you convenience I put questions marks in that filed, but what we want to see in that field is in our example a result of 400+105. Let me know if that can be achieved.