Small Mod for Classipress Wordpress Theme

Hello i want to change my classipress post ad page now it is like this: [login to view URL] I want to make it like this: [login to view URL] I just need to modify the step one means the first page that apear once you go to post page i want the first page when press post ad to look like [login to view URL] and when i select category and subcategory it will redirect to the normal page that i get after select category and pressing go button in the defaul classipress page. I can send screen shot of what i want and i already have the html css and jss for the layout - but i just need you to connect it to the backend as im not good about php so the job is to just replace that category dropdown with the menu i showed (i have all the static files for it) you just need to connect it to the software dinamically and of course when i press a subcategory it will redirect me to the same page that redirect with original theme let me know if i need to clarify anything else? And let me know the price to do it