Making links in Socialtext is very simple.
To add a link to a page in the workspace, first double-click to enter editing mode. Alternatively, click the Edit button.
Type the name of the page you want to link to, and turn it into a link simply by selecting it and clicking on in the toolbar.
If you make a link to a page that doesn't exist yet, your link will appear with a dotted underline. When you click on the link, the page will be created.