Hi Daphne,
So, on Cornerstone you have your content firstly in a section > which contain rows, which are blocks of content, you can have more than 1 row inside a section. Every row can be divided into Columns. If you have 1 column just your content will be initially aligned left.
O Cornerstone, on the column tab you have 4 icons for text-align, just like Word or any text software.
You can click text-align center button (which has a centered text icon) and the content of your column will be centered.
On text element you can add links, some elements will also take HTML code and adding a link HTML tag like this :
<a href="http://example.com"> Link Text </a>
resulting on Link Text
Not all elements will take HTML. Some elements like images, have a button to turn on the link.
Other like a feature list has a space for text link, but you cannot add HTML on the content boxes of the element.
If you want to add multiple elements in a column, you can add a text element, then a feature list for example, than others…
Hope it helps