Nice, but tricky – Total Recall - Mind Map Review

This is the first mind map app I've tried and it's helping me to organize thoughts and facts on a big project (article). It's basicallY good. But I'm losing some time because the "undo" feature isn't allowing me to click on my last action from the pop-up list - which means unless there's some trick I'm missing, "undo" doesn't work. Also, I'm unclear what the single-bubble option does on the formatting menus (the multiple-bubble option pulls up the color and bubble shape choices). The "getting started" tutorials are pretty basic, and don't cover these functions. They also refer to a website where help is available, but they don't link to it - and Google doesn't reveal it. So ... more complete tutorials would be great, or links to the website with the answers?
Review by HikeNWrite on Total Recall - Mind Map.