Yep, what luvmylocs said. When I say latching with my fingers, I just mean that I don't use a tool to latch (or interlock) my loc into the loose hair at the root. It is kind of awkward to explain in words. Here's a youtube vid that shows the method pretty well. She uses a tool for hers but, again, I just used my fingers. I chose latching over palm rolling for maintenance because it was just easier for me and I didn't have to worry about my roots not staying tight or using heavy product to hold it. I only used oil and water. But it's all about personal preference.
Retighten with Nappylocs - YouTube