Firstly, add the new document into the document exchange. Click on the 'settings' icon down the left hand side and select 'document exchange'.
Find the relevant folder you wish to upload the new document.
Once you are in the correct folder where you wish to upload the document, click on 'Folder' then 'new' and 'file'.
Select the file to upload and click on 'add files', give it a few seconds to upload and it should then show up in the relevant folder you choosen.
Select the page that you wish to edit, for example the 'Home'.
Click on the edit button to the left hand side.
Select the module you wish to amend/update or remove text/images or documents and click on the pencil icon.
Click on 'edit content' and you should then see this screen.
To just replace the link to a more updated version, right click on the necessary document and 'edit link'.
Click 'browse documents' and this will take you to the document exchange where you can select the required file and press 'Select File' and 'Save'.
Press 'Save' again to exit the 'edit content' page and you will return back to the module. Probably best to check the updated link has worked before exiting. When you are have finished editing you can exit by clicking 'I'm done editing' on the pencil icon on the left again.