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 .