By default, links added to the Site Notices are not clickable. 

To make links clickable, you may add the following HTML code to the site notices:

<a href="">Integrations</a>

Note: You may change the link "" to your own link and the text "Integrations" to your own text. If you are adding an internal link from your site, you may also add something like "members/maverick/activity/194400/" instead of the full link ""

See the sample screenshot below: