Once you have the rights and that you are logged-in, the "Edit This Page" button in the menu allows to switch to edit mode.
You will find information about the XWiki syntax on the right column when you are in edit mode. Once your document has been modified, you can preview it by clicking on the "Preview" button, or directly save it by clicking on the "Save" button. In the "preview" mode, don't forget to save your document !
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