Linking to other Confluence pages or external sites is done like so.
[Optional Title|URL or Confluence Page]
For instance, link to Google like this.
[Google Homepage|http://www.google.com]
The link will look like this: Google Homepage .
Link to the Confluence Instructions.
[Here is a link to the Confluence Instructions|Confluence Instructions]
This will show up like so: Here is a link to the Confluence Instructions
Alternately, you can leave out the title in either case.
[Confluence Instructions]
For a link like this: Confluence Instructions .