Editing a PDF design...

Won't bore you guys with the details, but how do you do this? I have a one piece cover that was designed for me, however the ISBN is going to need to be changed for another edition. I want to keep the cover art, but remove the barcode part to add the new one...

I can't edit anything in a pdf, but I can select the whole design and save it to paint, where a very simple "white square" removes the piece I want to block out, but how do I then safe that altered paint design as a pdf so I can use it? I don't want to get anyone in to help with this as that is no doubt another expense for a two minute job, but I'm at a dead end on this one...

The thing is that I don't think you can edit a pdf file, so surely it has to go into another programme first and then be transferred back. It's actually just a barcode I want to remove and it takes about 30 seconds on paint, I just don't know how to transfer the then updated paint version back to a pdf format lol!

Thanks so far guys, we're slowly getting there!

Ok I have a converter and I've now managed to get my very simply paint change into a pdf format, but...

now it's over two pages despite being the SAME SIZE AND DIMENSIONS as the original that I had copied into paint! Does anyone know how you get a pdf file so it's just one page and can be used as a one piece cover, not as a pdf "read me" type file!

Sorry, I can sense I'm going to be a huge pain tonight...

It's definitely two pages, it splits it just down the middle of the spine and there's a clear page break in the middle. I'm not really that technical minded sadly so I have a horrible feeling this "simple" adjustment is going to turn me into Basil Fawlty here...

I've copied it from a pdf to paint, made the small adjustment and then converted it back using pdf995 and now it's in two pages! The original is a large file, but is definitely one page, so I'm not sure what they have done to get what is essentially a landscape A3 style page compared to my portrait A4 double.

Sorry if I'm not describing it too well, spent most of the day trying to do this!

pdf995 is just installed a printer option, when you "print" using it, it opens up adobe and it's there and waiting for you as a two pager. I've gone through all the options across the task bar but with no help. I'll keep trying, but this was meant to be the easy bit of today's "to do" list lol!

Are you sure? Honestly that would be amazing as I'm genuinely not getting anywhere with this and have no idea what to do with it. If you pm me the address I'll send it across. Thanks you're a star and I really don't know what I'm doing wrong here!

Oh my word, you're some kind of magician! Honestly I can't thank you enough, although I'm a little...well I suppose the word is bitter I guess...that you did it in literally minutes after I spent the whole day struggling!

Thank you so much and this is why when anyone asks about writing or how to start I send them here. No comparisson on the net =)