Genealogy Online is purely a publication platform! You provide your data in GEDCOM format and this will be published on Genealogy Online. There are many good (offline) family tree programs that are much better equipped for editing genealogical data than any online variant. If the program can export the data to GEDCOM, you can place your data on this website! So if you have updated your family tree data in your family tree program then you can submit the updated file via https://www.genealogieonline.nl/en/mijn/ .
You can change various aspects of your publication via the administration page, such as:
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Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyright protected work may not simply be copied or republished.
Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.