Page History

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Once you have wiki edit privilege, an Edit button will appear in the upper right corner of each wiki document (next to Share and Tools). That takes you to the Edit window, where you should enter a brief note about the nature of your changes in a field at the bottom ("What did you change?") and then edit the doc.  A bar across the top has fairly obvious GUI symbols and there's help via the "?" button, top right.

 In the bottom right corner there's a Preview button (which toggles with Edit) and a Save button. The editor auto-saves and keeps your draft, which you can find in the drop-down list on your ID picture (upper right). When you use the Save button, email gets sent to everyone watching that wiki document unless you've unchecked "Notify watchers" at the bottom. If you save something and then decide it's all wrong, you can go to the page history and revert it. Page history is in the Tools drop-down list on every wiki page (but not in the editing window).

 It is good practice to put a doc comment on the JIRA that you're documenting, with a link to the doc, so people watching that JIRA can review the doc changes and future JIRA trawlers can find the docs easily.

 One more thing: please remember to include Hive version information with your changes, because the wiki covers all releases of Hive. You can mention the version in the text or use a Version info box ("+" icon drop-down list, "Info" fifth from the bottom, enter "Version" or "Version information" as the title).