Problems-No Calendar, and others

I am having some problems with Lotus Notes 8. I just installed it, but I had 7, and it did the same thing. BTW, I’m a computer technician. I’m new to Lotus and trying to learn it. For some reason, when I click on Calendar or To-do, it brings up my gmail account. I assume I set it up right. How do I change the e-mail account settings? Also, how do I fix this problem? Also, the Action Bar is missing items, like Tools-preferences. I have a Lotus book, and it does not appear the way it shoould. Also, it says “Unable to load frame’s content: Invalid or non-existent content.” It’s not working right. Please assist with these issues.