I'm not a professional. I have compilable pdf forms created with Adobe LiveCycle Designer (building application modules) I would need to add and remove pages, which I normally do with mac os preview, but with these modules I can not, what should I do? what programs should I use?
I am not completely sure what you mean but I will make a guess. You have a form that has sections (Modules). Within those sections, you would want to remove and add based on some input? If this is the case you can do this with Adobe LiveCycle Designer but you will need to understand the tool to achieve this. Once the form is created with Adobe LiveCycle the output will be a PDF Form that should be usable by you and others.
Ok so Mac OS preview is good but limited. If you need to add pages or insert attachments I would use Reader but there is one caveat to this. The file needs to first be extended to support additional functionality. A normal pdf in Reader does not inherently have this ability.