Move your cursor over the connector portion of a modeling element.
Hold the cursor over the outside edge of the modeling element until it changes from the arrow pointer to a hand.
Drag a line from the first activity to the connector of the second activity, and then release the mouse.
To change the link style, right-click the BP in the Project Explorer, and then click Toggle Link Style.
Click Save.
Add business rules to the links, as described in Incorporating Business Rules below (optional).