while insering text in the text capsule, enter the topic heading for the particular hub you need to link.Then Select the particular text(your hub's heading) and select the link tool from the text tool bar. Link tool will have a small 'chain' icon. Now a new window will appear and ask you to enter the url of the hub. Type the link and save it. Now you have created a link, this type of linkiing is called anchor text. Try it now.