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 Edit This Page.
Write the name of the page you want to link to. Then, select the text you want to link. Click 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.