Thanks for the details, Daisy. Do you mean an error message in a box that looks something like this?
If so, you can click the [more info] link for information on what has gone wrong.
Or give us the exact text of one of the messages, and we will try to help further.
When you are editing, if you change the value in a field or box, for example Birth Date, then the edge of the box changes colour. For me it changes to orange, but maybe this varies, so you could be seeing red box edges. This is not a problem: it is just intended as a reminder that you have changed that particular value.
You should still be able to save the results of your editing, by clicking the FULL SAVE: COMMIT CHANGES button, provided you have entered something in the Change explanation box.