I can give it a shot. I have PI 10 but I think it works the same for all versions.
Click on your text(make sure it is active) then right click. A column of choices appear. Pick change text attributes.
At the top of your page there will be three rows. The third row will start with the Font choice.
Go along that line to "border". Make sure there is a check mark for the border option,then pick color and size of border.
Just in case- To make a object active just click on the arrow at the top of the side panel,then click on the object you want to change.
Hope this works. The real expert is Julia and Nicks mom she should be by later.