This would probably be better asked in the InDesign Forum as it relates a little more to that program.
...as some files i do not have and were imported into the document with another computer.
If the files were 'placed' into InDesign, then InDesign keeps a note of the location of the image - the file is effectively linked. If you do not have these files, InDesign can't find them therefore you won't be able to edit the original. If you check the links panel on the right hand side, do you see a lot of red circles with ? inside?
If the files were embedded, you should see a small graphic icon next to each file in the links panel. If this is the case, you won't be able to edit that image without copy/pasting into another program (such as Photoshop) or re-linking to the original file.
thank you. yes i found some of the links. some were still working without the links though which i do not understand. is there another way of making this work without the links? or is that the only way indesign will read the content?
Thank you again!
If the files were originally placed, InDesign keeps a snapshot (low-res) version of the image for display purposes only - this could be why you still see them in the document. The links panel is really your best tool here as it will show you any problems with the images/files within the document. InDesign needs the original files. The only way it can work without the originals is if they were embedded before you got the file. If you can not find all required images, you will either need to link to new images or go back to the original computer that created the file and 'package' the document - this will give you access to everything the file used.