Just started botting again and I'm a little confused with how to set up randoms on osbot. I clicked dismiss all, but then some are left where you can check the box next to them? Any guidance on what to do here?

"Dismiss All" is an option for randoms which you can dismiss. You cannot dismiss an experience lamp, dismiss yourself from the frog cave random, etc. A few of the other random events are getting their dismissal code created. 

 

You are safe not doing anything with a random event (aka ignoring it). The random event will eventually just leave you alone and disappear.

So what does it mean to leave a box unchecked and what does it mean to check a box?

 

A box unchecked means when a random event appears, the bot will not try to solve it. A box checked means that the bot will solve it. If "Dismiss All" is checked and a checkbox becomes disabled, it means that the random event will be "Dismissed".