I urgently need help with Navigon's map manager for a trip later on today.

iOS & iPadOS
The map manager is confusing the heck out of me! I see the buttons labeled "Icon mapmanager slider" and "icon start download" next to each state. I double-tap on the state I want, in this case California, just in case. It now says "California, For downloading." I then double-tap on the button labeled "icon start download," and nothing seems to be happening, except that that California now says "California, 100.1 MB." What on Earth do I do? How do I know if it's been downloaded to my device or not? I'm so confused! Any help on this would be greatly appreciated! I'm taking a trip later on today, and I really need the GPS! Thanks, Shersey