You say Stanley no 5 so your plane is a Bailey pattern, which has a lateral-adjusting lever on the frog. Changing the angle of the cutting edge is the purpose of this lever. Push it towards the corner you want to pull up. 

Here's how the lateral works as shown by instructions in Stanley documents:

[![enter image description here][1]][1]

[![enter image description here][2]][2]

P.S. If your plane is a very early model, "pre lateral" as it is called, or if the lever is broken from the frog you can still adjust. Using a small hammer hit lightly the side of the iron with the projecting corner.