To be able to edit the wiki page, ask a current lab member to grant you space permission. To get space permission, your NYU net ID must be listed in NYU's wiki sites. To see whether you are registered (and if not, to register) go to NYU Wiki Dashboard. You can then login in the upper right. Once you have done this, you are in the system, and any lab member can grant you edit access to our lab wiki. The instructions to do so are here: https://confluence.atlassian.com/display/CONF43/Assigning+Space+Permissions
You almost certainly want to turn off all email notifications: https://wikis.nyu.edu/users/editmyemailsettings.action
All content should generally be kept on the lowest-level pages. Avoid putting content on intermediate table-of-contents-style pages.