Using IPN and Meetup.com

[johnincanada]

I am using Meetup.com for an event. I'm using PayPal to collect the attendance fee. 

a) How do I enable IPN?

b) What link do I put into the link space so that the person is automatically RSVP'd upon sending payment?

As a special bonus question:

c) Why, after I have logged into my PayPal account, and then enter something into the search box for help, does it show me as logged out?

Thanks!

[snowshoe]

For starters, see this guide:

https://www.x.com/sites/default/files/ipnguide.pdf

As for your bonus question, try deleting your browser's cookies, temp files and history.  Next close the browser, reopen it and retry logging in to your account.