Thanks for the information!

I was reading 3WayLinksSetup.pdf and there it said:
"When you first set up your site, ignore this checkbox. Do not check it. It should be left as shown in the image. It is only for use on sites which have been in the system some time and have already accumulated a number of links. You'll find more about it in the advanced lesson on modifying your existing links.".
So where can I found information about modifying existing links? For example can I edit my domain and change the kewords in primary, second and third link text and then update this information? Can I also check "Modify currently live links to new link text" and update this? What's the advantages of doing this, if any=)? Then I regret not choosing "Only give and receive links to/from sites in the same category as your site" for one of my domains. Can I check this and update my domain? As I understand, backlinks in the same category are more valuable and better for ranking.
For all this actions, do I have to send it on for approval again?
There's still much for me to learn about this...