The main place to get help is the official support/news subreddit, /r/olkb - the community is great at jumping in to help out others, and Jack comments on things when necessary. If you have a question specifically for Jack, there are weekly question threads where you can ask questions.
Please be patient! OLKB is a two-person operation (Jack and a shipping partner), and Jack handles nearly everything besides shipping. To see where you are in the queue, check out the entire order list.
Changes to orders
If you'd like to add something to your order, please cancel your previous order first, and re-order things completely - merging orders is a bit too difficult right now. If you'd to cancel, please email me directly at firstname.lastname@example.org with your order number, and I'll get things taken care of as soon as possible.
If you've received your order and are having issues with something, please email email@example.com with your order number, and I'll get it taken care of as soon as possible.