I am a new applevis member

Hello. I made an applevis account a few months ago but only now have just gotten time to look at it and I am having problems figuring it out. I have a few questions. I hope they are appropriate for this forum. Please let me know if they are not. 1. what is the difference between the forum and the blog? 2. I get stuff that is posted to the forum sent to my email, but is there a way to reply to posts without having to log in to my applevis account? I mean, can I reply just by sending an email? I know that I can not send it to the address where the original post came from, but is there somewhere else I can send it? 3. It looks like there is a master selection list that sets the delivery time limit for all of my subscriptions, but then there is also a selection list for each individual subscription beside them. There is also a check box beside each subscription so I can subscribe or unsubscribe to each thing individually, but There is also a check box with an amount of time that I can check or uncheck. Why is there both a check box and a selection list for each subscription? 4. What are the 2 hidden or visible options for? Thank you.