Install the Toolbox plugin
Create an 'on-click' workflow on whatever element you want to trigger the share function.
Paste into the action the following code:
text: '<THIS TEXT WILL BE SHARED WITH THE URL>',
Replace the contents of <> (including the <>) with your own text. In the above example, the shared text would be: "THIS TEXT WILL BE SHARED WITH THE URL WWW.EXAMPLEURL.COM"
You will also probably also want to install the IsMobile plugin and only show the share functionality if the user is on a mobile device