Hello @steven-patrick,
You taking questions here ?
Well we are in the process of setting up a daily thread so people can ask their SteemIt related questions and get help. So you got an early start!
If I delegate more SP to a user I already have some SP delegated to, is it immediate? Like if I change from 10SP delegated to 15SP, does it happen right away or will it take 7 days for the 10SP to undelegate.
All SP delegation is immediate. But, you'll have to stop the SP delegation and re-do the intended amount again. I believe there was someone working on a better way for this and well have to look up the source and edit this comment.