Sorry to be thick, but how do I upload a trip report? I can't find a button when I go to the trip report page. Thanks.

If the trip report is associated to a mountain (or area), then the best way is to look up the page for that mountain (or area) and on the left you'll have a menu item "Add Trip Report".

If not, then you can start with "Create Page" at the top left of the page, right above the summitpost.org logo. In the first dialog, select page type "Trip Report" and continue.