GB Activity Log
 

How do I change my activity log from mins.to miles walked?
Also, to change activities? I only have the basic GB.

Since you can't change the units selection, the only thing that I can think of is to create a new activity and call it Walking [Miles]. The only problem with this is that it will look strange when logged, i.e. Walking [Miles] (mins.) 5.

See the GB Help thread to enter activities.