No problem. Glad it's helped.
There isn't a video on exactly how to remove the vocals from a song. It's not an exact art and depends on the specific song.
What I could try doing is to explain any aspects from this post that you don't understand:
Do let me know in that thread if there is anything I can explain better.
If it makes it easier I can do a blog tip on this too sometime in the near future, to hopefully make it clearer. Here is the macProVideo blog:
As for the vocal styles, the Logic 101 tutorial will walk you through all the basics and many intermediate areas of Logic. Martin actually records a female vocalist during the tutorial as well.
For jazz, pop and rock recording into a condensor microphone in a small 'vocal booth' is ideal. However, simply ask the vocalist to stand at least 10cm away from the microphone or pop shield (which can cut out vocals pops and ssss sounds).
Ask the vocalist to maintain their distance from the microphone during the performance. (With some types of jazz singing closer to the microphone may be better to achieve a more intimate or sultry effect).
Most important is for the vocalist to feel comfortable and relaxed. This can include making sure their voice they listen to on their headphones sounds nice to them... and other instruments are at the right level for them to create the best possible performance.
That's all that comes to mind right now...